Best Diesel Exhaust System Cleaner of 2026

Last updated on 18/03/2026

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Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 1L Treats 1,000L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (1Litre)

Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 1L Treats 1,000L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (1Litre)

Transforms diesel into Super Fuel.
Ensures maximum engine performance.
Resolves potential engine problems.

Main Highlights

EXCEPTIONAL HIGH-PERFORMING SUPER DIESEL FUEL. AR6900-D MAX converts low-quality supermarket diesel into high-performing Super Diesel Fuel using a carefully selected blend of pure 2-EHN cetane improver, multiple detergents, ester lubricant, stabiliser and combustion catalyst.
HIGHLY CONCENTRATED FORMULATION with no fillers. 100% Active Ingredients and manufactured in the UK. 1ml Treats 1L of Diesel Fuel. 1L bottle treats up to 1,000L of fuel.
TRANSFORMS ALL DIESEL ENGINES GUARANTEED. Improved Cold Start, Eliminates Diesel Knock, Fuel System Cleaner, Fuel Injector Cleaner, Carbon Cleanr, DPF Cleaner, EGR Valve Cleaner, CAT Cleaner, Turbo Cleaner and Exhaust cleaner.
MAXIMUM ENGINE PERFORMANCE AND FUEL ECONOMY. This diesel additive maintains & improves engine pickup, performance and fuel economy. This diesel additive also lowers harmful exhaust emissions and exhaust particulates.
RESOLVES ENGINE PROBLEMS. Multiple detergents and post-combustion fuel-borne catalysts deliver a proprietary blend of Professional Grade Cleaning. Now you can reduce the chance of engine problems while enjoying a smoother and more responsive engine.
CLASS LEADING CETANE IMPROVER AND ESTER LUBRICANT using the highest purity 2-EHN and proprietary ester lubricant delivering below 290 on the HFRR scar wear test.
CUSTOMER SATISFACTION IS OUR PRIORITY. Feel free to contact us if you have any query regarding this diesel cleaner. All Archoil fuel cleaners include professional support and Performance and Emissions Pass Guarantee. Over a decade of success and trusted by professionals.

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Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 1L Treats 1,000L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (1Litre)

Transforms diesel into Super Fuel.
Ensures maximum engine performance.
Resolves potential engine problems.

Main Highlights

EXCEPTIONAL HIGH-PERFORMING SUPER DIESEL FUEL. AR6900-D MAX converts low-quality supermarket diesel into high-performing Super Diesel Fuel using a carefully selected blend of pure 2-EHN cetane improver, multiple detergents, ester lubricant, stabiliser and combustion catalyst.
HIGHLY CONCENTRATED FORMULATION with no fillers. 100% Active Ingredients and manufactured in the UK. 1ml Treats 1L of Diesel Fuel. 1L bottle treats up to 1,000L of fuel.
TRANSFORMS ALL DIESEL ENGINES GUARANTEED. Improved Cold Start, Eliminates Diesel Knock, Fuel System Cleaner, Fuel Injector Cleaner, Carbon Cleanr, DPF Cleaner, EGR Valve Cleaner, CAT Cleaner, Turbo Cleaner and Exhaust cleaner.
MAXIMUM ENGINE PERFORMANCE AND FUEL ECONOMY. This diesel additive maintains & improves engine pickup, performance and fuel economy. This diesel additive also lowers harmful exhaust emissions and exhaust particulates.
RESOLVES ENGINE PROBLEMS. Multiple detergents and post-combustion fuel-borne catalysts deliver a proprietary blend of Professional Grade Cleaning. Now you can reduce the chance of engine problems while enjoying a smoother and more responsive engine.
CLASS LEADING CETANE IMPROVER AND ESTER LUBRICANT using the highest purity 2-EHN and proprietary ester lubricant delivering below 290 on the HFRR scar wear test.
CUSTOMER SATISFACTION IS OUR PRIORITY. Feel free to contact us if you have any query regarding this diesel cleaner. All Archoil fuel cleaners include professional support and Performance and Emissions Pass Guarantee. Over a decade of success and trusted by professionals.

Value for Money

Archoil AR6400-D MAX Pro DPF Cleaner Diesel Fuel System, Diesel Injector Cleaner, Turbo, CAT Cleaner Concentrate - High Strength Carbon Removal & Exhaust Emissions Reduction for MOT Pass (400ml)

Archoil AR6400-D MAX Pro DPF Cleaner Diesel Fuel System, Diesel Injector Cleaner, Turbo, CAT Cleaner Concentrate - High Strength Carbon Removal & Exhaust Emissions Reduction for MOT Pass (400ml)

Improves fuel economy significantly.
Ensures thorough engine cleaning.
Offers full ester lubrication.

Main Highlights

FAST, SAFE AND THOROUGH CLEANING. Suitable for all diesel engines, AR6400-D engine MAX contains a proprietary blend of carefully selected diesel additives / detergents and acts as a diesel particulate filter cleaner, egr cleaner and entire fuel system cleaner (fuel injectors, fuel filter, fuel pump, fuel lines). Also cleans engine, combustion area, glow plugs, turbo, DPF and catalytic converter.
RESOLVES AND PREVENTS RUNNING ISSUES. This diesel engine cleaner helps free a problematic EGR and rapidly reduces harmful emissions and unwanted smoke from the exhaust. Resolve engine running issues and restore lost engine performance and fuel economy. Enjoy a smoother and more responsive engine.
RESTORES ENGINE PERFORMANCE AND IMPROVES FUEL ECONOMY. This diesel fuel additive / diesel cleaner has been shown to enhance fuel mileage year round, by acting as a diesel fuel system cleaner, fuel injector cleaner, diesel turbo cleaner and catalytic converter cleaner.
FULL ESTER LUBRICATION. Additional diesel treatment functions include a proven Cetane Improver using the highest purity 2-EHN, proprietary ester lubricant, water remover and much more.
CUSTOMER SATISFACTION IS OUR PRIORITY. Feel free to contact us if you have any query regarding this petrol cleaner. All Archoil fuel cleaners include professional support and Performance and Emissions Pass Guarantee. Over a decade of success and trusted by professionals.

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Archoil AR6400-D MAX Pro DPF Cleaner Diesel Fuel System, Diesel Injector Cleaner, Turbo, CAT Cleaner Concentrate - High Strength Carbon Removal & Exhaust Emissions Reduction for MOT Pass (400ml)

Improves fuel economy significantly.
Ensures thorough engine cleaning.
Offers full ester lubrication.

Main Highlights

FAST, SAFE AND THOROUGH CLEANING. Suitable for all diesel engines, AR6400-D engine MAX contains a proprietary blend of carefully selected diesel additives / detergents and acts as a diesel particulate filter cleaner, egr cleaner and entire fuel system cleaner (fuel injectors, fuel filter, fuel pump, fuel lines). Also cleans engine, combustion area, glow plugs, turbo, DPF and catalytic converter.
RESOLVES AND PREVENTS RUNNING ISSUES. This diesel engine cleaner helps free a problematic EGR and rapidly reduces harmful emissions and unwanted smoke from the exhaust. Resolve engine running issues and restore lost engine performance and fuel economy. Enjoy a smoother and more responsive engine.
RESTORES ENGINE PERFORMANCE AND IMPROVES FUEL ECONOMY. This diesel fuel additive / diesel cleaner has been shown to enhance fuel mileage year round, by acting as a diesel fuel system cleaner, fuel injector cleaner, diesel turbo cleaner and catalytic converter cleaner.
FULL ESTER LUBRICATION. Additional diesel treatment functions include a proven Cetane Improver using the highest purity 2-EHN, proprietary ester lubricant, water remover and much more.
CUSTOMER SATISFACTION IS OUR PRIORITY. Feel free to contact us if you have any query regarding this petrol cleaner. All Archoil fuel cleaners include professional support and Performance and Emissions Pass Guarantee. Over a decade of success and trusted by professionals.

Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Boosts and sustains engine performance.
Significantly reduces harmful emissions.
Enhances fuel efficiency and economy.

Main Highlights

VEHICLE MAINTENANCE > Safe for all engines, Cataclean original 8-in-1 engine cleaning system has been scientifically formulated to help your vehicle engine run better and last longer. Adding Cataclean as part of your regular vehicle maintenance routine to remove carbon build up improves fuel economy, reduce emissions, restores performance and protects catalytic converters
CLEANS & PROTECTS > Cataclean cleans, restores & protects the fuel tank and lines, fuel injectors, catalytic convertors, diesel particulate filters (DPF), exhaust gas recirculation valves, oxygen sensors, combustion chambers & intake and exhaust valves
REDUCE EMISSIONS > Regular use of Cataclean engine cleaning system can reduce emissions by up to 60% which can help prevent to MOT emissions failures and reduce air pollution
ENGINE PERFORMANCE > Using Cataclean fuel system cleaner restores engine performance, reduces vehicle maintenance costs and reduces fuel consumption, improving MPG fuel efficiency
USAGE > Add 500ml of Cataclean fuel additive per 15 litres of fuel every three months for optimum results

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Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Boosts and sustains engine performance.
Significantly reduces harmful emissions.
Enhances fuel efficiency and economy.

Main Highlights

VEHICLE MAINTENANCE > Safe for all engines, Cataclean original 8-in-1 engine cleaning system has been scientifically formulated to help your vehicle engine run better and last longer. Adding Cataclean as part of your regular vehicle maintenance routine to remove carbon build up improves fuel economy, reduce emissions, restores performance and protects catalytic converters
CLEANS & PROTECTS > Cataclean cleans, restores & protects the fuel tank and lines, fuel injectors, catalytic convertors, diesel particulate filters (DPF), exhaust gas recirculation valves, oxygen sensors, combustion chambers & intake and exhaust valves
REDUCE EMISSIONS > Regular use of Cataclean engine cleaning system can reduce emissions by up to 60% which can help prevent to MOT emissions failures and reduce air pollution
ENGINE PERFORMANCE > Using Cataclean fuel system cleaner restores engine performance, reduces vehicle maintenance costs and reduces fuel consumption, improving MPG fuel efficiency
USAGE > Add 500ml of Cataclean fuel additive per 15 litres of fuel every three months for optimum results

Wynn's Diesel Particulate Filter Cleaner - Heavy-Duty Cleaning for Severely Blocked DPFs - Restores Optimal Pressure Levels & Engine Performance - Biodegradable Formula - 5L

Wynn's Diesel Particulate Filter Cleaner - Heavy-Duty Cleaning for Severely Blocked DPFs - Restores Optimal Pressure Levels & Engine Performance - Biodegradable Formula - 5L

Cleans all types of DPF.
Restores DPF to correct pressure.
Biodegradable and vehicle-safe.

Main Highlights

✅ HEAVY-DUTY CLEANING SOLUTION FOR SEVERELY BLOCKED DPFs: Designed specifically for Diesel Particulate Filters (DPFs) that are heavily clogged with more than 70% soot loading. When standard regeneration methods fail to restore the filter’s functionality, this cleaning solution provides a powerful alternative. Formulated to break down stubborn soot, ash, and other particulate matter, it effectively eliminates obstructions that hinder proper engine performance.
✅ PROFESSIONAL-GRADE IN-HOUSE WORKSHOP CLEANING FORMULA: Developed as a specialised workshop solution, this formula is designed for professional use when dealing with critically clogged DPFs. Unlike standard cleaning additives, this advanced chemical formulation requires the removal of the filter from the vehicle to ensure thorough cleaning. By soaking the DPF for approximately two hours, the solution penetrates deep into the filter’s structure, dissolving accumulated deposits and restoring airflow.
✅ READY-TO-USE AND EASY APPLICATION FOR MAXIMUM EFFECTIVENESS: This DPF cleaner is pre-mixed and does not require any dilution, simplifying the cleaning process and ensuring precise chemical composition. For proper application, the Diesel Particulate Filter must be dismounted from the vehicle before treatment. Once removed, the solution is applied directly to the filter, allowing it to soak for the recommended time to maximise cleaning performance. No complex preparation or mixing is required, making the process straightforward while delivering exceptional results.
✅ SAFE, BIODEGRADABLE FORMULATION FOR ALL DPF TYPES: Manufactured with a biodegradable composition, this cleaner is safe for use on all types of Diesel Particulate Filters. The carefully developed formula ensures that it does not affect the function of the catalytic elements present in the filter, maintaining the integrity of the emissions system. It is designed to remove contaminants without causing damage to delicate components, making it a reliable solution for restoring blocked DPFs while prioritising environmental responsibility.
✅ RESTORES PROPER DPF PRESSURE LEVELS AND ENGINE PERFORMANCE: By effectively eliminating blockages caused by soot, ash, and other harmful contaminants, this cleaner plays a crucial role in restoring the DPF to its correct pressure levels. A clean DPF allows the engine to function as intended, reducing backpressure and improving fuel efficiency. Vehicles struggling with poor acceleration, increased emissions, and frequent regeneration cycles can benefit from this deep-cleaning treatment, ensuring smoother performance and prolonged filter life.

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Wynn's Diesel Particulate Filter Cleaner - Heavy-Duty Cleaning for Severely Blocked DPFs - Restores Optimal Pressure Levels & Engine Performance - Biodegradable Formula - 5L

Cleans all types of DPF.
Restores DPF to correct pressure.
Biodegradable and vehicle-safe.

Main Highlights

✅ HEAVY-DUTY CLEANING SOLUTION FOR SEVERELY BLOCKED DPFs: Designed specifically for Diesel Particulate Filters (DPFs) that are heavily clogged with more than 70% soot loading. When standard regeneration methods fail to restore the filter’s functionality, this cleaning solution provides a powerful alternative. Formulated to break down stubborn soot, ash, and other particulate matter, it effectively eliminates obstructions that hinder proper engine performance.
✅ PROFESSIONAL-GRADE IN-HOUSE WORKSHOP CLEANING FORMULA: Developed as a specialised workshop solution, this formula is designed for professional use when dealing with critically clogged DPFs. Unlike standard cleaning additives, this advanced chemical formulation requires the removal of the filter from the vehicle to ensure thorough cleaning. By soaking the DPF for approximately two hours, the solution penetrates deep into the filter’s structure, dissolving accumulated deposits and restoring airflow.
✅ READY-TO-USE AND EASY APPLICATION FOR MAXIMUM EFFECTIVENESS: This DPF cleaner is pre-mixed and does not require any dilution, simplifying the cleaning process and ensuring precise chemical composition. For proper application, the Diesel Particulate Filter must be dismounted from the vehicle before treatment. Once removed, the solution is applied directly to the filter, allowing it to soak for the recommended time to maximise cleaning performance. No complex preparation or mixing is required, making the process straightforward while delivering exceptional results.
✅ SAFE, BIODEGRADABLE FORMULATION FOR ALL DPF TYPES: Manufactured with a biodegradable composition, this cleaner is safe for use on all types of Diesel Particulate Filters. The carefully developed formula ensures that it does not affect the function of the catalytic elements present in the filter, maintaining the integrity of the emissions system. It is designed to remove contaminants without causing damage to delicate components, making it a reliable solution for restoring blocked DPFs while prioritising environmental responsibility.
✅ RESTORES PROPER DPF PRESSURE LEVELS AND ENGINE PERFORMANCE: By effectively eliminating blockages caused by soot, ash, and other harmful contaminants, this cleaner plays a crucial role in restoring the DPF to its correct pressure levels. A clean DPF allows the engine to function as intended, reducing backpressure and improving fuel efficiency. Vehicles struggling with poor acceleration, increased emissions, and frequent regeneration cycles can benefit from this deep-cleaning treatment, ensuring smoother performance and prolonged filter life.

Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Improves fuel efficiency.
Prevents emissions failures.
Restores engine performance.

Main Highlights

VEHICLE MAINTENANCE > Safe for all engines, Cataclean original 8-in-1 engine cleaning system has been scientifically formulated to help your vehicle engine run better and last longer. Adding Cataclean as part of your regular vehicle maintenance routine to remove carbon build up improves fuel economy, reduce emissions, restores performance and protects catalytic converters
CLEANS & PROTECTS > Cataclean cleans, restores & protects the fuel tank and lines, fuel injectors, catalytic convertors, diesel particulate filters (DPF), exhaust gas recirculation valves, oxygen sensors, combustion chambers & intake and exhaust valves
REDUCE EMISSIONS > Regular use of Cataclean engine cleaning system can reduce emissions by up to 60% which can help prevent to MOT emissions failures and reduce air pollution
ENGINE PERFORMANCE > Using Cataclean fuel system cleaner restores engine performance, reduces vehicle maintenance costs and reduces fuel consumption, improving MPG fuel efficiency
USAGE > Add 500ml of Cataclean fuel additive per 15 litres of fuel every three months for optimum results

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Cataclean Diesel | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Improves fuel efficiency.
Prevents emissions failures.
Restores engine performance.

Main Highlights

VEHICLE MAINTENANCE > Safe for all engines, Cataclean original 8-in-1 engine cleaning system has been scientifically formulated to help your vehicle engine run better and last longer. Adding Cataclean as part of your regular vehicle maintenance routine to remove carbon build up improves fuel economy, reduce emissions, restores performance and protects catalytic converters
CLEANS & PROTECTS > Cataclean cleans, restores & protects the fuel tank and lines, fuel injectors, catalytic convertors, diesel particulate filters (DPF), exhaust gas recirculation valves, oxygen sensors, combustion chambers & intake and exhaust valves
REDUCE EMISSIONS > Regular use of Cataclean engine cleaning system can reduce emissions by up to 60% which can help prevent to MOT emissions failures and reduce air pollution
ENGINE PERFORMANCE > Using Cataclean fuel system cleaner restores engine performance, reduces vehicle maintenance costs and reduces fuel consumption, improving MPG fuel efficiency
USAGE > Add 500ml of Cataclean fuel additive per 15 litres of fuel every three months for optimum results

Wynn's Total Action Diesel Cleaner – All-in-One Fuel and Exhaust System Cleaner – Protects Injectors, Valves, Turbo, DPF, EGR & Combustion Chamber – 325ml

Wynn's Total Action Diesel Cleaner – All-in-One Fuel and Exhaust System Cleaner – Protects Injectors, Valves, Turbo, DPF, EGR & Combustion Chamber – 325ml

Boosts Engine Performance significantly.
Promotes Better Fuel Economy.
Minimizes Exhaust Emissions effectively.

Main Highlights

✅ TRIPLE ACTION CLEANING POWER – BEFORE, DURING AND AFTER COMBUSTION: The advanced formulation of this diesel cleaner ensures a comprehensive three-phase cleaning process that begins before combustion, continues during combustion, and persists after the combustion cycle. This multi-level cleaning approach targets and eliminates carbon deposits, unburnt fuel residues, and accumulated soot within the system, which typically hinder engine efficiency and longevity. By working at every stage of the combustion process, this product offers superior internal cleansing that goes beyond traditional single-phase treatments.
✅ FULL SYSTEM COVERAGE – CLEANS THE ENTIRE FUEL AND EXHAUST SYSTEM: This total action diesel cleaner delivers deep cleaning across the entire fuel and exhaust system, including crucial and sensitive areas that are often neglected. Its powerful formula is designed to effectively clean fuel injectors, intake valves, the diesel particulate filter (DPF), exhaust gas recirculation (EGR) valves, the turbocharger, and the combustion chamber. By targeting all these critical components, the product helps maintain smoother fuel flow, optimal air intake, and efficient exhaust gas processing.
✅ 6-COMPONENT PROTECTION – PRESERVES ENGINE LONGEVITY: The formulation is engineered to provide protection for six vital components within diesel engines: the injectors, valves, DPF, EGR system, turbocharger, and combustion chamber. This protective capability not only cleans but also shields these components from further deposit build-up and corrosion. Continuous use helps prevent degradation of engine performance, reduces the likelihood of costly repairs, and contributes to extending the engine’s operational lifespan.
✅ REDUCES EXHAUST EMISSIONS – HELPS MEET ENVIRONMENTAL STANDARDS: Through its targeted cleaning action, this diesel cleaner significantly reduces harmful exhaust emissions, including particulate matter, nitrogen oxides, and unburned hydrocarbons. By restoring optimal combustion efficiency and ensuring clean injectors and emission control devices, the cleaner helps vehicles meet stringent emission regulations and environmental standards. This function is particularly valuable for high-mileage diesel engines and fleet vehicles that operate under demanding conditions.
✅ IMPROVES FUEL ECONOMY – RESTORES POWER AND REDUCES CONSUMPTION: By removing harmful deposits and improving the performance of key components, this product contributes to a noticeable improvement in fuel economy. Clean injectors and combustion chambers allow for more efficient fuel burning, reducing overall diesel consumption. Restored turbocharger and EGR valve functions further enhance airflow and engine breathing, leading to smoother acceleration and better throttle response. These enhancements help maximise the energy derived from each litre of diesel, making it an excellent solution for those seeking to maintain peak fuel efficiency and minimise operational costs over the long term.

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Wynn's Total Action Diesel Cleaner – All-in-One Fuel and Exhaust System Cleaner – Protects Injectors, Valves, Turbo, DPF, EGR & Combustion Chamber – 325ml

Boosts Engine Performance significantly.
Promotes Better Fuel Economy.
Minimizes Exhaust Emissions effectively.

Main Highlights

✅ TRIPLE ACTION CLEANING POWER – BEFORE, DURING AND AFTER COMBUSTION: The advanced formulation of this diesel cleaner ensures a comprehensive three-phase cleaning process that begins before combustion, continues during combustion, and persists after the combustion cycle. This multi-level cleaning approach targets and eliminates carbon deposits, unburnt fuel residues, and accumulated soot within the system, which typically hinder engine efficiency and longevity. By working at every stage of the combustion process, this product offers superior internal cleansing that goes beyond traditional single-phase treatments.
✅ FULL SYSTEM COVERAGE – CLEANS THE ENTIRE FUEL AND EXHAUST SYSTEM: This total action diesel cleaner delivers deep cleaning across the entire fuel and exhaust system, including crucial and sensitive areas that are often neglected. Its powerful formula is designed to effectively clean fuel injectors, intake valves, the diesel particulate filter (DPF), exhaust gas recirculation (EGR) valves, the turbocharger, and the combustion chamber. By targeting all these critical components, the product helps maintain smoother fuel flow, optimal air intake, and efficient exhaust gas processing.
✅ 6-COMPONENT PROTECTION – PRESERVES ENGINE LONGEVITY: The formulation is engineered to provide protection for six vital components within diesel engines: the injectors, valves, DPF, EGR system, turbocharger, and combustion chamber. This protective capability not only cleans but also shields these components from further deposit build-up and corrosion. Continuous use helps prevent degradation of engine performance, reduces the likelihood of costly repairs, and contributes to extending the engine’s operational lifespan.
✅ REDUCES EXHAUST EMISSIONS – HELPS MEET ENVIRONMENTAL STANDARDS: Through its targeted cleaning action, this diesel cleaner significantly reduces harmful exhaust emissions, including particulate matter, nitrogen oxides, and unburned hydrocarbons. By restoring optimal combustion efficiency and ensuring clean injectors and emission control devices, the cleaner helps vehicles meet stringent emission regulations and environmental standards. This function is particularly valuable for high-mileage diesel engines and fleet vehicles that operate under demanding conditions.
✅ IMPROVES FUEL ECONOMY – RESTORES POWER AND REDUCES CONSUMPTION: By removing harmful deposits and improving the performance of key components, this product contributes to a noticeable improvement in fuel economy. Clean injectors and combustion chambers allow for more efficient fuel burning, reducing overall diesel consumption. Restored turbocharger and EGR valve functions further enhance airflow and engine breathing, leading to smoother acceleration and better throttle response. These enhancements help maximise the energy derived from each litre of diesel, making it an excellent solution for those seeking to maintain peak fuel efficiency and minimise operational costs over the long term.

Wynn's Pre-Emission Test MOT Treatment - Reduces Exhaust Emissions & Black Smoke - Cleans Fuel System, Injectors & DPF - Compatible with All Diesel Components - 325ml

Wynn's Pre-Emission Test MOT Treatment - Reduces Exhaust Emissions & Black Smoke - Cleans Fuel System, Injectors & DPF - Compatible with All Diesel Components - 325ml

Reduces exhaust emissions swiftly.
Improves overall engine performance.
Cleans the entire fuel system.

Main Highlights

✅ REDUCES EXHAUST EMISSIONS AND SOOT: Specially formulated to lower exhaust emissions, this advanced treatment helps vehicles meet strict emission standards. Its powerful cleaning action targets soot buildup in the fuel system, reducing harmful pollutants released into the air. By optimising combustion, it minimises unburned fuel residues that contribute to excessive emissions. Designed for diesel engines, including modern common rail and pump injector systems, it effectively addresses emission concerns, ensuring cleaner and more efficient engine operation.
✅ REDUCES BLACK SMOKE FOR CLEANER EXHAUST EMISSIONS: Black smoke from diesel engines is often a sign of incomplete combustion, leading to excessive soot production. This powerful pre-MOT treatment actively reduces black smoke by improving fuel atomisation and optimising the air-to-fuel ratio. By cleaning injectors and restoring their precise spray pattern, it ensures better fuel distribution and more complete combustion. As a result, engines produce significantly less visible smoke, leading to a cleaner exhaust output. Whether for routine maintenance or preparing for an emissions test, this formula helps vehicles run smoother while reducing their environmental impact.
✅ IMPROVES COMBUSTION, ENGINE PERFORMANCE, AND FUEL ECONOMY: Engine efficiency relies on clean fuel delivery and optimal combustion. This specialised formula enhances the combustion process by eliminating deposits that hinder fuel flow and ignition. By improving fuel atomisation and ensuring proper injector performance, it allows for more efficient energy conversion. The result is a noticeable improvement in engine power, smoother acceleration, and enhanced fuel economy. Better combustion reduces strain on engine components, leading to improved longevity and reliability. Suitable for all diesel engines, this treatment supports overall vehicle performance and efficiency.
✅ CLEANS THE ENTIRE FUEL SYSTEM, INCLUDING DPF AND CATALYST: Diesel engines require a clean fuel system to operate at peak performance. This advanced treatment cleans the entire fuel system, from the injectors to the Diesel Oxidation Catalyst and Diesel Particulate Filter (DPF). By breaking down and removing harmful deposits, it restores optimal fuel flow and ensures that critical components remain free from clogging. A cleaner fuel system leads to improved combustion, lower emissions, and better engine responsiveness. Safe for use with all diesel system components, it helps maintain a cleaner, more efficient fuel delivery system.
✅ COMPATIBLE WITH ALL DIESEL SYSTEM COMPONENTS, INCLUDING DPF AND SCR SYSTEMS: Designed for versatility, this treatment is fully compatible with modern diesel engines and emission control systems. It works seamlessly with catalytic converters, Diesel Particulate Filters (DPF), and Selective Catalytic Reduction (SCR) systems without causing damage or interference. By keeping these critical components clean and functional, it helps maintain emission control efficiency and prolongs the lifespan of engine parts.

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Wynn's Pre-Emission Test MOT Treatment - Reduces Exhaust Emissions & Black Smoke - Cleans Fuel System, Injectors & DPF - Compatible with All Diesel Components - 325ml

Reduces exhaust emissions swiftly.
Improves overall engine performance.
Cleans the entire fuel system.

Main Highlights

✅ REDUCES EXHAUST EMISSIONS AND SOOT: Specially formulated to lower exhaust emissions, this advanced treatment helps vehicles meet strict emission standards. Its powerful cleaning action targets soot buildup in the fuel system, reducing harmful pollutants released into the air. By optimising combustion, it minimises unburned fuel residues that contribute to excessive emissions. Designed for diesel engines, including modern common rail and pump injector systems, it effectively addresses emission concerns, ensuring cleaner and more efficient engine operation.
✅ REDUCES BLACK SMOKE FOR CLEANER EXHAUST EMISSIONS: Black smoke from diesel engines is often a sign of incomplete combustion, leading to excessive soot production. This powerful pre-MOT treatment actively reduces black smoke by improving fuel atomisation and optimising the air-to-fuel ratio. By cleaning injectors and restoring their precise spray pattern, it ensures better fuel distribution and more complete combustion. As a result, engines produce significantly less visible smoke, leading to a cleaner exhaust output. Whether for routine maintenance or preparing for an emissions test, this formula helps vehicles run smoother while reducing their environmental impact.
✅ IMPROVES COMBUSTION, ENGINE PERFORMANCE, AND FUEL ECONOMY: Engine efficiency relies on clean fuel delivery and optimal combustion. This specialised formula enhances the combustion process by eliminating deposits that hinder fuel flow and ignition. By improving fuel atomisation and ensuring proper injector performance, it allows for more efficient energy conversion. The result is a noticeable improvement in engine power, smoother acceleration, and enhanced fuel economy. Better combustion reduces strain on engine components, leading to improved longevity and reliability. Suitable for all diesel engines, this treatment supports overall vehicle performance and efficiency.
✅ CLEANS THE ENTIRE FUEL SYSTEM, INCLUDING DPF AND CATALYST: Diesel engines require a clean fuel system to operate at peak performance. This advanced treatment cleans the entire fuel system, from the injectors to the Diesel Oxidation Catalyst and Diesel Particulate Filter (DPF). By breaking down and removing harmful deposits, it restores optimal fuel flow and ensures that critical components remain free from clogging. A cleaner fuel system leads to improved combustion, lower emissions, and better engine responsiveness. Safe for use with all diesel system components, it helps maintain a cleaner, more efficient fuel delivery system.
✅ COMPATIBLE WITH ALL DIESEL SYSTEM COMPONENTS, INCLUDING DPF AND SCR SYSTEMS: Designed for versatility, this treatment is fully compatible with modern diesel engines and emission control systems. It works seamlessly with catalytic converters, Diesel Particulate Filters (DPF), and Selective Catalytic Reduction (SCR) systems without causing damage or interference. By keeping these critical components clean and functional, it helps maintain emission control efficiency and prolongs the lifespan of engine parts.

STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK

STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK

Cleans and restores performance.
Lowers exhaust emissions.
Reduces rough idling.

Main Highlights

STP Diesel Bundle contains STP Diesel Injector Cleaner 200ml and STP Ultra 5-in-1 Diesel System Cleaner 400ml
Cleans & Unclogs: Powerful STP Diesel Injector Cleaner clears dirty injectors with just one treatment
Restores Performance: STP Ultra 5-in-1 System Cleaner is our most advanced diesel formula, helping to remove deposits and clear dirty injectors
Lowers Emissions: A cleaner engine may mean less exhaust emissions and lower fuel consumption
For All Diesel Engines: Suitable for all diesel engines including DI, IDI and common rail, and catalytic converters
Quick & Easy: Simply pour the entire bottle of STP Diesel Injector Cleaner or STP Diesel System Cleaner into a full tank
Reduces Rough Idling: For a smoother engine experience

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STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK

Cleans and restores performance.
Lowers exhaust emissions.
Reduces rough idling.

Main Highlights

STP Diesel Bundle contains STP Diesel Injector Cleaner 200ml and STP Ultra 5-in-1 Diesel System Cleaner 400ml
Cleans & Unclogs: Powerful STP Diesel Injector Cleaner clears dirty injectors with just one treatment
Restores Performance: STP Ultra 5-in-1 System Cleaner is our most advanced diesel formula, helping to remove deposits and clear dirty injectors
Lowers Emissions: A cleaner engine may mean less exhaust emissions and lower fuel consumption
For All Diesel Engines: Suitable for all diesel engines including DI, IDI and common rail, and catalytic converters
Quick & Easy: Simply pour the entire bottle of STP Diesel Injector Cleaner or STP Diesel System Cleaner into a full tank
Reduces Rough Idling: For a smoother engine experience

Wynn's High Performance Diesel Fuel System Treatment - Enhances Combustion, Improves Acceleration, Reduces Fuel Consumption & Black Smoke - 500ml

Wynn's High Performance Diesel Fuel System Treatment - Enhances Combustion, Improves Acceleration, Reduces Fuel Consumption & Black Smoke - 500ml

Improves engine performance instantly.
Reduces fuel consumption effectively.
Protects against oxidation.

Main Highlights

✅ IMPROVES COMBUSTION FOR OPTIMAL ENGINE PERFORMANCE: This high-performance diesel treatment is formulated to enhance combustion efficiency immediately upon use. The powerful blend of active ingredients optimises the fuel-to-air ratio, allowing for a cleaner and more complete burn inside the engine. As a result, the engine runs more smoothly and efficiently, leading to improved throttle response and faster acceleration. Enhanced combustion also contributes to a reduction in harmful emissions and particulate matter, resulting in a cleaner exhaust. This makes it particularly effective for vehicles that operate under demanding conditions, where peak engine performance is essential.
✅ REDUCES FUEL CONSUMPTION FOR COST-EFFICIENT DRIVING: By promoting more complete combustion, this treatment directly contributes to a reduction in fuel consumption. It maximises the energy extracted from each litre of diesel, helping the engine to deliver better mileage without compromising performance. Whether used in long-distance driving or frequent short trips, this product supports fuel efficiency by optimising the way diesel is burned. The result is lower fuel costs over time and less frequent refuelling. Regular application helps maintain this improved fuel economy, making it a smart choice for fuel-conscious drivers and fleet operators alike.
✅ REDUCES BLACK SMOKE FOR CLEANER EMISSIONS: This advanced diesel system treatment addresses one of the most visible signs of inefficient fuel use: black smoke. By improving the combustion process, the treatment drastically reduces unburned hydrocarbons that manifest as dark exhaust. This contributes not only to a cleaner vehicle but also to a more environmentally friendly operation. Vehicles treated with this formula emit noticeably less smoke, which can be a critical factor in passing emission tests or complying with urban environmental regulations.
✅ PROTECTS THE FUEL SYSTEM FROM OXIDATION AND CORROSION: The formula includes special additives designed to shield the fuel system from the damaging effects of oxidation and corrosion. Diesel engines are particularly susceptible to water contamination and fuel degradation, which can lead to rust, corrosion, and the formation of sludge within the fuel tank and injection system. This treatment provides a protective barrier that inhibits these processes, extending the lifespan of fuel components such as injectors, pumps, and lines. It is especially beneficial in vehicles that are not used regularly, where stagnant diesel may pose a greater risk.
✅ TREATS UP TO 70 LITRES WITH ONE 500ML BOTTLE: The concentrated nature of this formula ensures that a single 500ml bottle is sufficient to treat up to 70 litres of diesel fuel. This high-yield ratio makes it a cost-effective solution for those looking to maintain peak engine performance without frequent applications. Suitable for cars, vans, trucks, and other diesel-powered machinery, this treatment integrates seamlessly into routine maintenance schedules. Its easy-to-use format allows it to be poured directly into the fuel tank, ensuring fast action and visible results.

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Wynn's High Performance Diesel Fuel System Treatment - Enhances Combustion, Improves Acceleration, Reduces Fuel Consumption & Black Smoke - 500ml

Improves engine performance instantly.
Reduces fuel consumption effectively.
Protects against oxidation.

Main Highlights

✅ IMPROVES COMBUSTION FOR OPTIMAL ENGINE PERFORMANCE: This high-performance diesel treatment is formulated to enhance combustion efficiency immediately upon use. The powerful blend of active ingredients optimises the fuel-to-air ratio, allowing for a cleaner and more complete burn inside the engine. As a result, the engine runs more smoothly and efficiently, leading to improved throttle response and faster acceleration. Enhanced combustion also contributes to a reduction in harmful emissions and particulate matter, resulting in a cleaner exhaust. This makes it particularly effective for vehicles that operate under demanding conditions, where peak engine performance is essential.
✅ REDUCES FUEL CONSUMPTION FOR COST-EFFICIENT DRIVING: By promoting more complete combustion, this treatment directly contributes to a reduction in fuel consumption. It maximises the energy extracted from each litre of diesel, helping the engine to deliver better mileage without compromising performance. Whether used in long-distance driving or frequent short trips, this product supports fuel efficiency by optimising the way diesel is burned. The result is lower fuel costs over time and less frequent refuelling. Regular application helps maintain this improved fuel economy, making it a smart choice for fuel-conscious drivers and fleet operators alike.
✅ REDUCES BLACK SMOKE FOR CLEANER EMISSIONS: This advanced diesel system treatment addresses one of the most visible signs of inefficient fuel use: black smoke. By improving the combustion process, the treatment drastically reduces unburned hydrocarbons that manifest as dark exhaust. This contributes not only to a cleaner vehicle but also to a more environmentally friendly operation. Vehicles treated with this formula emit noticeably less smoke, which can be a critical factor in passing emission tests or complying with urban environmental regulations.
✅ PROTECTS THE FUEL SYSTEM FROM OXIDATION AND CORROSION: The formula includes special additives designed to shield the fuel system from the damaging effects of oxidation and corrosion. Diesel engines are particularly susceptible to water contamination and fuel degradation, which can lead to rust, corrosion, and the formation of sludge within the fuel tank and injection system. This treatment provides a protective barrier that inhibits these processes, extending the lifespan of fuel components such as injectors, pumps, and lines. It is especially beneficial in vehicles that are not used regularly, where stagnant diesel may pose a greater risk.
✅ TREATS UP TO 70 LITRES WITH ONE 500ML BOTTLE: The concentrated nature of this formula ensures that a single 500ml bottle is sufficient to treat up to 70 litres of diesel fuel. This high-yield ratio makes it a cost-effective solution for those looking to maintain peak engine performance without frequent applications. Suitable for cars, vans, trucks, and other diesel-powered machinery, this treatment integrates seamlessly into routine maintenance schedules. Its easy-to-use format allows it to be poured directly into the fuel tank, ensuring fast action and visible results.

Wynn's Diesel Particulate Filter Cleaner - Cleans & Regenerates Blocked DPF Soot Filters - Reduces Soot Formation & Emissions - Compatible with Diesel & Hybrid Diesel up to B30-325ml

Wynn's Diesel Particulate Filter Cleaner - Cleans & Regenerates Blocked DPF Soot Filters - Reduces Soot Formation & Emissions - Compatible with Diesel & Hybrid Diesel up to B30-325ml

Reduces frequent maintenance costs significantly.
Effectively clears blocked soot filters.
Ideal for city driving cycles.

Main Highlights

✅ AVOIDS FREQUENT MAINTENANCE COSTS RELATED TO MANUAL DPF REGENERATION: The use of this product helps prevent the costly and time-consuming manual regeneration of a blocked diesel particulate filter. When a particulate filter becomes clogged with soot, traditional maintenance methods often require professional intervention, dismantling, or even replacement, leading to high repair costs. By incorporating this solution into regular vehicle care, the soot filter is continuously regenerated while driving, reducing the need for garage visits and prolonging the lifespan of the filter.
✅ CLEARS AND REGENERATES BLOCKED SOOT FILTERS WITHOUT DISMANTLING: Designed to effectively clean and regenerate blocked diesel particulate filters, this product eliminates the need for dismantling, making the process both efficient and hassle-free. Soot accumulation within the filter can lead to engine inefficiency, increased fuel consumption, and even potential damage to the exhaust system. With the advanced burn-off technology, soot particles are completely incinerated during normal driving conditions, helping to restore the filter’s functionality.
✅ REDUCES SOOT FORMATION DURING THE DIESEL FUEL COMBUSTION CYCLE: This highly effective formula minimises the formation of soot during the combustion cycle of diesel fuel, improving overall engine efficiency. Excessive soot buildup can result in reduced power output, higher emissions, and increased fuel consumption, all of which impact the performance and longevity of the vehicle. By optimising the combustion process, this product promotes cleaner engine operation, helping to maintain consistent power delivery while ensuring reduced carbon deposits.
✅ IDEAL FOR CITY DRIVING TRIPS WITH FREQUENT STOPS AND IDLING: Vehicles operating in urban environments face a higher risk of soot accumulation due to frequent stopping, idling, and short-distance travel. These conditions prevent the diesel particulate filter from reaching the high temperatures required for passive regeneration, leading to faster clogging and reduced engine efficiency. This formula is specifically designed to assist in the regeneration process, ensuring that the filter remains clean even in low-speed driving conditions. By enabling the complete burn-off of soot particles, it helps maintain exhaust system performance, reducing the chances of filter blockage.
✅ COMPATIBLE WITH DIESEL AND HYBRID DIESEL UP TO B30 (PREMIUM AND REGULAR): Engineered to provide versatility and efficiency, this product is fully compatible with diesel and hybrid diesel engines, supporting fuel compositions up to B30. Whether used in premium or regular diesel vehicles, it ensures optimal soot reduction and particulate filter regeneration. The advanced formulation allows it to integrate seamlessly with various fuel types, delivering outstanding performance without affecting engine reliability.

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Wynn's Diesel Particulate Filter Cleaner - Cleans & Regenerates Blocked DPF Soot Filters - Reduces Soot Formation & Emissions - Compatible with Diesel & Hybrid Diesel up to B30-325ml

Reduces frequent maintenance costs significantly.
Effectively clears blocked soot filters.
Ideal for city driving cycles.

Main Highlights

✅ AVOIDS FREQUENT MAINTENANCE COSTS RELATED TO MANUAL DPF REGENERATION: The use of this product helps prevent the costly and time-consuming manual regeneration of a blocked diesel particulate filter. When a particulate filter becomes clogged with soot, traditional maintenance methods often require professional intervention, dismantling, or even replacement, leading to high repair costs. By incorporating this solution into regular vehicle care, the soot filter is continuously regenerated while driving, reducing the need for garage visits and prolonging the lifespan of the filter.
✅ CLEARS AND REGENERATES BLOCKED SOOT FILTERS WITHOUT DISMANTLING: Designed to effectively clean and regenerate blocked diesel particulate filters, this product eliminates the need for dismantling, making the process both efficient and hassle-free. Soot accumulation within the filter can lead to engine inefficiency, increased fuel consumption, and even potential damage to the exhaust system. With the advanced burn-off technology, soot particles are completely incinerated during normal driving conditions, helping to restore the filter’s functionality.
✅ REDUCES SOOT FORMATION DURING THE DIESEL FUEL COMBUSTION CYCLE: This highly effective formula minimises the formation of soot during the combustion cycle of diesel fuel, improving overall engine efficiency. Excessive soot buildup can result in reduced power output, higher emissions, and increased fuel consumption, all of which impact the performance and longevity of the vehicle. By optimising the combustion process, this product promotes cleaner engine operation, helping to maintain consistent power delivery while ensuring reduced carbon deposits.
✅ IDEAL FOR CITY DRIVING TRIPS WITH FREQUENT STOPS AND IDLING: Vehicles operating in urban environments face a higher risk of soot accumulation due to frequent stopping, idling, and short-distance travel. These conditions prevent the diesel particulate filter from reaching the high temperatures required for passive regeneration, leading to faster clogging and reduced engine efficiency. This formula is specifically designed to assist in the regeneration process, ensuring that the filter remains clean even in low-speed driving conditions. By enabling the complete burn-off of soot particles, it helps maintain exhaust system performance, reducing the chances of filter blockage.
✅ COMPATIBLE WITH DIESEL AND HYBRID DIESEL UP TO B30 (PREMIUM AND REGULAR): Engineered to provide versatility and efficiency, this product is fully compatible with diesel and hybrid diesel engines, supporting fuel compositions up to B30. Whether used in premium or regular diesel vehicles, it ensures optimal soot reduction and particulate filter regeneration. The advanced formulation allows it to integrate seamlessly with various fuel types, delivering outstanding performance without affecting engine reliability.

We scanned 392 products

We reviewed these offers relevant to the Diesel Exhaust System Cleaner within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Archoil, Cataclean, Wynn's, STP, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Diesel Exhaust System Cleaner in the market, we considered we took a deep dive into 1961 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 1L Treats 1,000L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (1Litre). We love many things about this product by Archoil. What sets it apart from the competition is Transforms diesel into Super Fuel. , Ensures maximum engine performance. , Resolves potential engine problems.
The best value product for most shoppers and where user satisfaction is continuously the highest is Archoil AR6400-D MAX Pro DPF Cleaner Diesel Fuel System, Diesel Injector Cleaner, Turbo, CAT Cleaner Concentrate - High Strength Carbon Removal & Exhaust Emissions Reduction for MOT Pass (400ml) by Archoil based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Diesel Exhaust System Cleaner and the best cost-to-value ratio is STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UKat STP with a 20% discount.
Our list of the best Diesel Exhaust System Cleaner is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.