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10 Best Full Synthetic 5w 40 Engine Oil in The UK

Last updated on 08/07/2025
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Best Choice
1
9.8
Exceptional
Save 7%
Castrol EDGE 5W-40 Engine Oil 5L
Castrol
Castrol EDGE 5W-40 Engine Oil 5L
7% OffFree Shipping
Why We Love It
  • Improves overall engine efficiency.
  • Sustains maximum horsepower longer.
  • Delivers superior protection consistently.
Main Highlights
  • Suitable for use in automotive gasoline and diesel vehicles where the manufacturer recommends: ACEA C3, API SN/CF Lubricant
  • Specifications: ACEA C3 API SN/CF Meets Fiat 9.55535-S2 Meets Ford WSS-M2C917-A GM dexos2 * MB-Approval 226.5/ 229.31/ 229.51 Renault RN 0700 / RN 0710 VW 505 00/ 505 01
  • Delivers unsurpassed levels of protection across a variety of driving conditions and temperatures
  • Independently proven to Improve engine efficiency
  • Delivers and sustains maximum horsepower for longer, even when under pressure
9.8
Exceptional
Save 7%
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Best Value
2
9.8
Exceptional
Comma SYN5L 5L Syner-G Full Synthetic 5W40 Motor Oil
Comma
Comma SYN5L 5L Syner-G Full Synthetic 5W40 Motor Oil
Free Shipping
Why We Love It
  • Compact size for easy storage.
  • Premium quality ensures durability.
  • Optimal for big weight packages.
Main Highlights
  • Premium Product
9.8
Exceptional
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3
9.7
Exceptional
Save 3%
Valvoline SynPower MST C3 5W-40 Fully Synthetic Engine Oil - 842034-5 Litres
Silkolene
Valvoline SynPower MST C3 5W-40 Fully Synthetic Engine Oil - 842034-5 Litres
3% Off
Why We Love It
  • Reduces emissions and enhances efficiency.
  • Enhances engine and filter lifetime.
  • Fights heat, deposits, wear.
Main Highlights
  • Through use of synthetic base oil technology SynPower XL-III C3 motor oil fights the three major causes of engine stress – heat, deposits and wear
  • Suitable for long drain intervals according to the BMW, MB, and VW specifications
  • Suitable for EURO V engines with Diesel Particle Filters
  • Special additive chemistry reduces emissions and  enhances fuel efficiency vs reference oil.  
  • Enhances the lifetime of the engine and the Diesel Particle Filter
9.7
Exceptional
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4
9.5
Superb
Save 6%
Mannol 20 Litre Energy 5W-30 Engine Oil 7511 API SN/CH-4 ACEA A3/B4 Universal Synthetic Ester Technology
MANNOL
Mannol 20 Litre Energy 5W-30 Engine Oil 7511 API SN/CH-4 ACEA A3/B4 Universal Synthetic Ester Technology
6% OffFree Shipping
Why We Love It
  • Meets diverse auto manufacturer specs.
  • Suitable for numerous vehicle models.
  • Ensures optimal engine performance.
Main Highlights
  • SPECIFICATIONS: SAE 5W-30 Synthetic Engine Oil
  • RECOMMENDATION: API SN/CH-4, ACEA A3/B4, VOLKSWAGEN 502 00, VOLKSWAGEN 505 00, VOLKSWAGEN 503 01, VOLKSWAGEN 501 01, MB 229.3, MB 229.5, BMW LL-98, RENAULT RN0710, RENAULT RN0700, FORD WSS-M2C913-B
  • PRODUCT PROPERTIES: Innovative universal premium ester-containing engine oil for modern gasoline and diesel engines with and without turbocharging. Designed based on the requirements of European car manufacturers.
  • ADDITIONAL INFO: Designed for gasoline and diesel engines of a wide fleet of cars (cars, light utility vehicles, vans and light trucks) of European and other manufacturers.
  • DISCLAIMER: The oil is not suitable for use in heavy trucks and similar vehicles!
9.5
Superb
Save 6%
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5
9.4
Superb
Mannol 5 Litre Energy Formula PD 5W-40 Engine Oil 7913 API SN ACEA C3 Universal Fully Synthetic Ester Technology
MANNOL
Mannol 5 Litre Energy Formula PD 5W-40 Engine Oil 7913 API SN ACEA C3 Universal Fully Synthetic Ester Technology
Free Shipping
Why We Love It
  • Meets multiple vehicle specifications.
  • Recommended by numerous manufacturers.
  • Guarantees exceptional engine performance.
Main Highlights
  • SPECIFICATIONS: SAE 5W-40 Fully Synthetic Engine Oil
  • RECOMMENDATION: API SN, ACEA C3, MB 229.51, MB 229.31, MB 226.5, GM dexos2, PORSCHE A40, VOLKSWAGEN 505 00, VOLKSWAGEN 505 01, FORD WSS-M2C917-A, ACEA C2, BMW LL-04, FIAT 9.55535-S2, FIAT 9.55535-GH2, RENAULT RN0700, RENAULT RN0710, CHRYSLER MS-11106
  • PRODUCT PROPERTIES: Innovative universal energy-saving ester-containing fully synthetic premium motor oil for modern diesel engines (including those with direct injection) and gasoline engines with and without turbocharging, including those equipped with pump nozzles (Pumpe-Duse).
  • ADDITIONAL INFO: Designed for gasoline and diesel engines of the EURO IV and EURO V standard of a wide fleet of cars (cars, light SUVs, minibuses and light trucks) of European and other manufacturers).
  • DISCLAIMER: The oil is not suitable for use in heavy trucks and similar vehicles!
9.4
Superb
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6
9.4
Superb
Elf Evolution 900 NF 5W-40 Engine Oil, 5 Litre, 5 L
ELF
Elf Evolution 900 NF 5W-40 Engine Oil, 5 Litre, 5 L
Free Shipping
Why We Love It
  • Meets strict industry standards.
  • Compatible with major brands.
  • Convenient 15,000km change interval.
Main Highlights
  • ACEA: A3/B4.
  • API: SL/CF.
  • VOLKSWAGEN 502.00/505.00 (VW, Audi, Seat, Skoda...).
  • MERCEDES BENZ MB-Approval 229.3 (MB, Chrysler...).
  • Recommended to change: Every 15,000km.
9.4
Superb
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7
9.3
Superb
Carlube Triple R 5W-30 ACEA C3, API SP Fully Synthetic Engine Oil R-TEC 21 5L
Carlube
Carlube Triple R 5W-30 ACEA C3, API SP Fully Synthetic Engine Oil R-TEC 21 5L
Free Shipping
Why We Love It
  • Superior engine cleanliness enabled.
  • Increased fuel economy offered.
  • Enhanced chilly weather performance.
Main Highlights
  • SPECIFICATION: ACEA C3-21, API SP, MB229.31.
  • HIGH PERFORMANCE: As a lubricant that meets the highest performance engine oil specification, Carlube Triple R 5W-30 R-Tec 21 provides a number of key benefits to vehicle owners, including superior engine cleanliness, wear protection, fuel economy and aftertreatment device compatibility.
  • LOW SAPS: As a low SAPS (low in Sulfated Ash, Phosphorus and Sulfur) lubricant specifically designed for use in engines with after-treatment devices, Carlube Triple R 5W-30 R-Tec 21 protects both the engine and the environment.
  • EXCEEDS SPECIFICATIONS: The Carlube Triple R oil range meets or exceeds the API, ACEA specifications and has full Block Exemption certification and major manufacturer approvals.
  • FULLY SYNTHETIC ENGINE OIL: Fully synthetic engine oils offer increased engine protection and longer engine life, reduced friction and enhanced lubrication during extreme chilly weather starts and increased fuel economy.
9.3
Superb
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8
9.1
Superb
Valvotech PD/PI 5W/40 Fully Synthetic Engine Oil - 5 Litre…
Valvotech
Valvotech PD/PI 5W/40 Fully Synthetic Engine Oil - 5 Litre…
Why We Love It
  • Fully synthetic for superior performance.
  • Excellent stability in temperatures.
  • Improves fuel efficiency remarkably.
Main Highlights
  • Fully synthetic formulation
  • Excellent high and low temperature stability
  • Improved fuel efficiency
  • Improved fuel efficiency
  • Superior performance to mineral based oils
  • Stay in grade properties
9.1
Superb
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9
8.9
Excellent
Redex 5w-40 Fully Synthetic Engine Oil MB, VW, RN, 2 Litre
Redex
Redex 5w-40 Fully Synthetic Engine Oil MB, VW, RN, 2 Litre
Free Shipping
Why We Love It
  • Suitable for various car types.
  • Premium quality ensures longevity.
  • Promotes Eco-friendly emissions reduction.
Main Highlights
  • Fully synthetic 5W-40 oil which is suitable for both petrol and diesel cars, including those with fuel injected, multivalved and turbo charged engines
  • Recommended for applications requiring: API SL CF; ACEA A3/B4; API SL CF “ACEA A3/B4” MB 229.1; MB 229.3; VW 502 00, VW 505 00; RN0700, RN0710; A40
  • Fully synthetic oil is a premium oil which doesn’t degrade as quickly as conventional oil; It also helps to reduce emissions and withstands higher and lower temperatures to avoid engine wear and keep your car running longer
  • Our premium synthetic oil lasts longer between service intervals, meaning you don’t need to change it as often; This is convenient for you, saves you money, and reduces waste oil
  • Always refer to your manufacturer guidelines to choose your oil, or use our Redex Oil Finder lookup
8.9
Excellent
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10
8.8
Excellent
Castrol MAGNATEC 5W-40 C3 Engine Oil 1L
Castrol
Castrol MAGNATEC 5W-40 C3 Engine Oil 1L
Free Shipping
Why We Love It
  • Suitable for numerous engines.
  • Bonds strongly to metal.
  • Offers continuous protection.
Main Highlights
  • Suitable for use in automotive gasoline and diesel engines where the manufacturer recommends an ACEA C3, API SN or earlier specification 5W-40 lubricant.
  • Specifications: ACEA C3 API SN BMW Longlife-04 Meets Fiat 9.55535-S3 MB-Approval 226.5/ 229.31/ 229.51 Renault RN 0700 / RN 0710
  • Bonds to metal surfaces to make engine parts more resistant to wear
  • Are combined with synthetic technology to provide increased protection in high and low temperature applications
  • Provides continuous protection for all driving conditions, styles and temperatures
8.8
Excellent
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Lucas Oil 47044 Synthetic 5W-40 C3 Engine Oil - 1 Litre
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We scanned 444 products

We reviewed these offers relevant to the Full Synthetic 5w 40 Engine Oil 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 Castrol, Comma, Silkolene, MANNOL, ELF, Carlube, Valvotech, Redex, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.
For the best Full Synthetic 5w 40 Engine Oil in the market, we considered we took a deep dive into 2221 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 Castrol EDGE 5W-40 Engine Oil 5L. We love many things about this product by Castrol. What sets it apart from the competition is Improves overall engine efficiency, Sustains maximum horsepower longer, Delivers superior protection consistently.
  • The best value product for most shoppers and where user satisfaction is continuously the highest is Comma SYN5L 5L Syner-G Full Synthetic 5W40 Motor Oil by Comma based on online reviews by bloggers, experts and online shoppers.
  • The biggest bargain at the moment for Full Synthetic 5w 40 Engine Oil and the best cost-to-value ratio is Castrol EDGE 5W-40 Engine Oil 5Lat Castrol with a 7% discount.
  • Our list of the best Full Synthetic 5w 40 Engine Oil 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.