Advertising Disclosure Car Oil 5w40 Comparison - April 2026
7 Best Car Oil 5w40 In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Advertising Disclosure
| 1 Best Choice  9.6Exceptional | 2 Best Value 9.3Excellent | 3  9.2Excellent | 4 9.1Excellent | 5  8.8Very Good | 6 8.5Good | 7  8.2Good |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelCastrol EDGE 5W-40 Engine Oil 4L | Model Castrol EDGE 5W-40 Engine Oil 4L | Model Castrol MAGNATEC 5W-40 C3 Engine Oil 5L | Model Castrol MAGNATEC 5W-40 C3 Engine Oil 5L | Model Castrol EDGE 5W-40 Engine Oil 1L | Model Castrol EDGE 5W-40 Engine Oil 1L | Model Redex 5w-40 Fully Synthetic Engine Oil MB, VW, RN, 2 Litre |
BrandCastrol | Brand Castrol | Brand Castrol | Brand Castrol | Brand Castrol | Brand Castrol | Brand Redex |
Reviews | Reviews  | Reviews | Reviews | Reviews  | Reviews | Reviews |
Tech Specs | ||||||
product dimensions12.6 x 18.8 x 27.2 cm; 3.57 kg | product dimensions 12.6 x 18.8 x 27.2 cm; 3.57 kg | product dimensions 12.6 x 18.8 x 32 cm 4.43 kg | product dimensions 12.6 x 18.8 x 32 cm 4.43 kg | product dimensions 6.56 x 9.8 x 23.9 cm 860 g | product dimensions 6.56 x 9.8 x 23.9 cm 860 g | product dimensions 9.6 x 16 x 23 cm 1.78 kg |
item weight3.57 kg | item weight 3.57 kg | item weight 4.43 kg | item weight 4.43 kg | item weight 860 g | item weight 860 g | item weight 1.78 kg |
viscosity5W40 sae_grade | viscosity 5W40 sae_grade | viscosity 5W 40 | viscosity 5W 40 | viscosity 5W 40 | viscosity 5W 40 | viscosity 5W-40 |
manufacturer part number15F7D6 | manufacturer part number 15F7D6 | manufacturer part number 15F625 | manufacturer part number 15F625 | manufacturer part number 15F7D5 | manufacturer part number 15F7D5 | manufacturer part number RMTN0008A |
modelEDGE | model EDGE | model MAGNATEC | model MAGNATEC | model EDGE | model EDGE | model RMTN0008A |
positionDriveline | position Driveline | position Driveline | position Driveline | position Driveline | position Driveline | position - |
Available On | Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.6
1Castrol37% OffCastrol EDGE 5W-40 Engine Oil 4L
Why we love it
Boosts engine performance even under pressure.
Improves engine efficiency, proven independently.
Compatible with many high-end car brands.
Main highlights- Suitable for ACEA C3
- Specifications: API SN/CF - BMW Longlife-01 - MB-Approval 226.5/ 229.3/ 229.5 - Porsche A40 - Renault RN0700 / RN0710 - VW 502 00/ 505 00
- Independently proven to improve engine efficiency
- Castrol EDGE lowers friction and maximises engine performance
- Castrol EDGE boosted with Titanium FST sustains maximum performance even when under pressure
-
9.3
2Castrol43% Off
Castrol EDGE 5W-40 Engine Oil 4L
Why we love it
Boosts engine performance even under pressure.
Improves engine efficiency, proven independently.
Compatible with many high-end car brands.
Main highlights- Suitable for ACEA C3
- Specifications: API SN/CF - BMW Longlife-01 - MB-Approval 226.5/ 229.3/ 229.5 - Porsche A40 - Renault RN0700 / RN0710 - VW 502 00/ 505 00
- Independently proven to improve engine efficiency
- Castrol EDGE lowers friction and maximises engine performance
- Castrol EDGE boosted with Titanium FST sustains maximum performance even when under pressure
-
9.2
3Castrol23% Off
Castrol MAGNATEC 5W-40 C3 Engine Oil 5L
Main highlights- Suitable for use in automotive gasoline and diesel engines where the manufacturer recommends an ACEA C3, API SN Plus or earlier specification 5W-40 lubricant.
- Specifications: - ACEA C3 API SN Plus BMW Longlife-04 Meets Fiat 9.55535-S2 Warranted by Castrol to be completely suitable for use in vehicles where the following specifications apply: MB 229.31/ 229.51/ 229.52
- Offer non-stop protection from every start
- Bond 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
Our ranking system
The topchoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. topchoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
Consumer Reviews
We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
