We Chose The Best Pre Treatments in The UK - 11/2025

Wynn's Pre-MOT Emission Test Fuel System Cleaner - Reduces CO, HC & Exhaust Smoke - Cleans Injectors & Improves Combustion - Treats Catalytic Converter & GPF - 325ml

Wynn's Pre-MOT Emission Test Fuel System Cleaner - Reduces CO, HC & Exhaust Smoke - Cleans Injectors & Improves Combustion - Treats Catalytic Converter & GPF - 325ml

Wynn's

15% OffFree Shipping

Why we love it

Passes MOT emissions easily.
Boosts fuel efficiency.
Restores injector performance.

Main Highlights

✅ REDUCES EXHAUST EMISSIONS TO HELP PASS YOUR MOT: Specially formulated to reduce harmful emissions, this treatment is ideal as a fast-acting solution before an MOT emissions test. By improving combustion efficiency and reducing the build-up of carbon residues within the fuel system, it significantly lowers levels of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gases. This helps vehicles meet stringent emission standards and comply with testing requirements. Whether used in older or newer vehicles, the formula addresses the key contributors to emissions test failures, such as excessive exhaust smoke and unburnt fuel particles.
✅ ENHANCES ENGINE COMBUSTION AND PERFORMANCE: Developed with advanced combustion-improving agents, this treatment enhances the overall efficiency of the engine. By optimising the air-fuel mixture and promoting cleaner fuel burn, it boosts engine responsiveness and torque. The result is smoother acceleration, reduced engine knocking, and a more stable idle. This improved combustion process also aids in achieving better fuel atomisation, leading to improved power output and better throttle response. It supports the longevity of the engine by minimising internal friction and preventing the formation of carbon build-up that could impair performance over time.
✅ CLEANS INJECTORS FOR RESTORED SPRAY PATTERN: This high-performance additive targets injector nozzles, removing gum, varnish, and carbon deposits that accumulate with regular fuel use. Clean injectors are crucial to maintaining a precise spray pattern, which ensures the correct atomisation of fuel and an efficient combustion cycle. Restoring the injector spray pattern leads to more effective fuel delivery, better combustion, and reduced emissions. Over time, dirty injectors can cause uneven idling, misfires, and loss of engine power.
✅ TREATS THE ENTIRE FUEL SYSTEM INCLUDING CATALYTIC CONVERTER & GPF: Designed to work throughout the entire fuel system, this treatment not only cleans injectors but also reaches the catalytic converter and Gasoline Particulate Filter (GPF). It breaks down and removes harmful deposits that can block these critical components and lead to performance losses or emissions test failure. This comprehensive cleaning action helps maintain the flow and efficiency of the exhaust after-treatment system, allowing it to function properly.
✅ IMPROVES FUEL ECONOMY AND REDUCES HARMFUL SMOKE: By enhancing combustion efficiency and ensuring clean injector operation, this formula directly contributes to fuel savings. Improved fuel atomisation results in more complete combustion of every drop of fuel, reducing waste and increasing mileage. Additionally, the product reduces exhaust smoke — particularly noticeable in older vehicles or those with accumulated carbon deposits. Cleaner combustion also means fewer unburned hydrocarbons are released into the atmosphere, making the vehicle more environmentally friendly.

8.8

Excellent

Black Friday Deal

8.8

Excellent

Wynn's

Wynn's Pre-MOT Emission Test Fuel System Cleaner - Reduces CO, HC & Exhaust Smoke - Cleans Injectors & Improves Combustion - Treats Catalytic Converter & GPF - 325ml

15% OffFree ShippingBlack Friday Deal

Why we love it

Passes MOT emissions easily.
Boosts fuel efficiency.
Restores injector performance.

Main Highlights

✅ REDUCES EXHAUST EMISSIONS TO HELP PASS YOUR MOT: Specially formulated to reduce harmful emissions, this treatment is ideal as a fast-acting solution before an MOT emissions test. By improving combustion efficiency and reducing the build-up of carbon residues within the fuel system, it significantly lowers levels of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gases. This helps vehicles meet stringent emission standards and comply with testing requirements. Whether used in older or newer vehicles, the formula addresses the key contributors to emissions test failures, such as excessive exhaust smoke and unburnt fuel particles.
✅ ENHANCES ENGINE COMBUSTION AND PERFORMANCE: Developed with advanced combustion-improving agents, this treatment enhances the overall efficiency of the engine. By optimising the air-fuel mixture and promoting cleaner fuel burn, it boosts engine responsiveness and torque. The result is smoother acceleration, reduced engine knocking, and a more stable idle. This improved combustion process also aids in achieving better fuel atomisation, leading to improved power output and better throttle response. It supports the longevity of the engine by minimising internal friction and preventing the formation of carbon build-up that could impair performance over time.
✅ CLEANS INJECTORS FOR RESTORED SPRAY PATTERN: This high-performance additive targets injector nozzles, removing gum, varnish, and carbon deposits that accumulate with regular fuel use. Clean injectors are crucial to maintaining a precise spray pattern, which ensures the correct atomisation of fuel and an efficient combustion cycle. Restoring the injector spray pattern leads to more effective fuel delivery, better combustion, and reduced emissions. Over time, dirty injectors can cause uneven idling, misfires, and loss of engine power.
✅ TREATS THE ENTIRE FUEL SYSTEM INCLUDING CATALYTIC CONVERTER & GPF: Designed to work throughout the entire fuel system, this treatment not only cleans injectors but also reaches the catalytic converter and Gasoline Particulate Filter (GPF). It breaks down and removes harmful deposits that can block these critical components and lead to performance losses or emissions test failure. This comprehensive cleaning action helps maintain the flow and efficiency of the exhaust after-treatment system, allowing it to function properly.
✅ IMPROVES FUEL ECONOMY AND REDUCES HARMFUL SMOKE: By enhancing combustion efficiency and ensuring clean injector operation, this formula directly contributes to fuel savings. Improved fuel atomisation results in more complete combustion of every drop of fuel, reducing waste and increasing mileage. Additionally, the product reduces exhaust smoke — particularly noticeable in older vehicles or those with accumulated carbon deposits. Cleaner combustion also means fewer unburned hydrocarbons are released into the atmosphere, making the vehicle more environmentally friendly.

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