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      *Representative Example. Standard Purchases: 18.9% p.a. variable. Representative 18.9% APR variable. Total amount of credit: £1200. This is for Illustrative purposes only and actual total amount of credit may differ.

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Castrol GTX Engine Oil 15W40 - 4L
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Castrol GTX Engine Oil 15W40 - 4L

Price: £21.00

Product availability status:

In Stock

Collect in store from FREE
from an ASDA store FREE
Collect+ Information to a local store: £4.50

Delivery Details

Delivered from £2.95
by Wednesday 31 December
Standard: 3-5 days £2.95
Next day £4.50
Named day £4.50
Named day and time £5.95
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    Product Details


    Castrol GTX 15W-40 a3/B4 fights sludge, the engine cholesterol! Castrol GTX 15W-40 a3/B3 provides 25a better protection against sludge than the latest industry standard. Liquid Engineering protects against problems that your engine faces every day.

    Sludge build-up in your engine can lead to increased deposit formation, reduced oil flow and premature engine failure.

    approvals  Specifications:

    • aCEa a3/B3
    • aPI SL/CF
    • MB-approved 229.1
    • VW 505 00

    From the Manufacturer|Powered by Answers™

    Thank You Is the information in this section helpful? Yes / No

    We can help you find the right oil for your car

    • Castrol GTX Protects your engine against Sludge build up and provides a balanced performance under all types of conditions. It is specially engineered to prevent the harmful build-up of engine sludge, reducing oil deposits and providing everyday protection for your engine.

      Castrol GTX provides 25% better protection against sludge than the latest industry standard.*

    How to Top up your oil

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    Useful information

    Viscocity is a measurement of the oil's thickness. Take 5W-30 for example, the “5W” is the Winter rating and tells us how thin the oil is when cold, smaller numbers here mean better circulation on start up from cold. The second number, “30” relates to how thick the oil is when the engine is at working temperature, the bigger the number, the thicker the oil film is between all the moving surfaces. However, thicker oil can lead to less fuel efficiency so a balance between protection and efficiency must be met. Some cars need a specific viscosity, some cars can use different viscosities.

    It’s important to find out which viscosity your car needs so that the engine is protected properly. You can do this by checking your vehicle handbook or by texting “OIL” and your vehicle reg to 60777*.
    Types of Oil
    Modern oils are made up of a blend of base oils and additives. The “base oils” can be Mineral, Part or Fully Synthetic. Many modern vehicles have performance requirements which need the better quality Fully Synthetic oils. Part Synthetic oils are a blend of mineral and Fully Synthetic oils. These offer some of the performance benefits, but at a cheaper price than Fully Synthetic oils. Some older cars can use Part Synthetic oils, but Fully Synthetic oils offer better performance and protection all round.
    Not all oils are the same
    Some oils only meet a certain performance level. Castrol oils are formulated in partnership with major car manufacturers to exceed the performance levels and provide extra protection.

    With over 100 years of formulating oils you can be sure Castrol oils are going to give your engine the protection and performance it deserves.


    ACEA A3/B3
    Meets Fiat 9.55535-D2
    MB-Approval 229.1
    VW 501 01/ 505 00


    * vs. API SL &/or ACEA A3/B4 Industry standards

    Full Specification

    Size 4L
    Colour White
    Dimensions 256 x 260 x 117mm
    Material Plastic
    Product Type Engine Oil
    Type Engine Oils
    Weight 3.6kg
    Brand Castrol
    Rated 5 out of 5 by 24 reviewers.
    Rated 5 out of 5 by Good Product , Good value form Asda It says on the tin The Castrol GTX 15W40 Oil provides superior protection against problems that your engine faces every day, like smoke and leaks. I agree with that 03 January 2013
    Rated 5 out of 5 by Good purchase I was told about this offer by a friend. I got enough for a few oil changes. Not seen it at this price for years! 22 January 2012
    Rated 5 out of 5 by Castrol GTX 15W-40 A3B3 - 4L What can I say bout this product? Its a great product for a fantastic price, Highly recommended!! Well Done ASDA 20 January 2012
    Rated 5 out of 5 by A great deal This oil is the life blood of my motorcycle and when it's on offer for such a fantastic price I had to buy two! 28 January 2012
    Rated 5 out of 5 by Castrol GTX is great stuff ! I have been using Castrol for years, my dad used castrol and my grandad used Castrol ! For most cars on the road today it as good now as it was many mant years ago. I run a Jaguar as a daily driver and is as silky now as ever. Definately reccomend and makes a good present for dads who dont want socks! (true petrol heads obviously or else it might seem odd gift) 26 October 2011
    Rated 5 out of 5 by always use castrol the oil I used when the car was young was casrtol now the car has done 155000 miles I still use castrol and get from 26/34 mpg in a 2.5 ltr. mpg in a heavy bodied car 22 January 2013
    Rated 5 out of 5 by Castrol GTX oil This was the best deal on oil i could find .not only was it the best price but a good quolity brand as well great shopping expereance 24 November 2011
    Rated 5 out of 5 by Great Deal , Great Service My first purchase from ASDA direct. In store before stated time, well packaged and easy to collect. Will definately Purchase again. 28 January 2013
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