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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 Reviews

Price: £21.00

Product availability status:

In Stock

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

Delivery Details

Delivered from £2.95
by Saturday 03 January
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 Very Good Deal This is a very good product.I was double pleased with great quality product and good price as I bought it in half price. 01 January 2012
    Rated 5 out of 5 by excellent bargain The offer from Asda was exceptional value. I always use Castrol oil in my car and usually pay almost twice as much. 21 July 2012
    Rated 5 out of 5 by Does what it says on the tin! Castrol GTX at this price - absolute bargain, in hindsight I should have got 2. Great deal - great price! 03 January 2013
    Rated 5 out of 5 by A real bargain for a well known brand I did not need to buy 3 cans but at thr price on offer it would be silly not too while ASDA had deal . 19 June 2014
    Rated 5 out of 5 by exactly as ordered just as described ,just as priced,did what was required of it(engine oil change}no probs nice buy. 01 November 2011
    Rated 5 out of 5 by Castrol GTX this is a great price for a top brand oil, you can be pretty sure that it will do a good job 01 January 2012
    Rated 5 out of 5 by Best Value Ever Service was due on my car and I found this at a bargain price on the Direct website. 28 December 2011
    Rated 5 out of 5 by value ! high quality product at a reasonable price when compared to other retailers 11 January 2013
    Rated 5 out of 5 by excellent quality oil As usual this is an oil you can rely on for performance vehicles 31 December 2013
    Rated 5 out of 5 by Bargain Good value for money. Does the job for little money. 12 January 2013
    Rated 5 out of 5 by Good deal Great price on branded car engine oil. 26 January 2012
    Rated 5 out of 5 by Low in cost and high in quality Low in cost and high in quality 12 August 2012
    Rated 5 out of 5 by best quality cheapest price only on asda 15 January 2012
    Rated 5 out of 5 by oil 15 November 2011
    Rated 5 out of 5 by rates up there 11 June 2013
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