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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 10W40 - 4L
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Castrol GTX Engine Oil 10W40 - 4L Reviews

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     Protect your car from harmful sludge with Castrol GTX 10W-40 a3/B4, which contains anti-sludge formula that provides 25a better sludge protection compared to tough industry standards.*

    Liquid Engineering protects against problems that your engine faces every day.

    * Vs aPI SL /or aCEa a3/B4 Industry standards

    approvals  Specifications

    • aCEa a3/B4
    • aPI SL/CF
    • MB-approval 229.1
    • VW 501 01


    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, A3/B4
    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 4.9 out of 5 by 53 reviewers.
    Rated 3 out of 5 by Cheapest GTX Found this to be the cheapest price for GTX, we put this in customers old bangers and they like the GTX bit of tradition, wouldnt put it in my own vehicles, if i need a semi synthetic 10w40 we use Fuchs/Silkolene Titan XTR semi synthetic. 04 December 2011
    Rated 5 out of 5 by Good quality oil, sensibly priced! I change my engine oil twice a year with the oil filter and it does help to find a good qulity oil at half price!! and this is the 3rd time I buy my oil from asda. Oil and filter already changed and clocking mileage. 04 January 2013
    Rated 5 out of 5 by Serious good value Simply check out the price of engine oil in competitors web sites. Add pick-up from your local ASDA store with no delivery charges, plus useful text message when goods ready to pick brainier! 18 January 2012
    Rated 5 out of 5 by Excellent Value Totally Excellent oil, my car is a nissan almera, a timing chain car , so I need quality oil to keep it running smooth. The car has increased performance , runs a lot smoother , What more can I say 20 July 2012
    Rated 5 out of 5 by excellent valiue castrol is a world brand- you know what you are going to get... to coin a well known saying"it does what it says on the tin"... the price was unbelievable!!! 23 January 2013
    Rated 4 out of 5 by Well Oiled Good Price for a Good Product. All parts of transaction ran smoothly. Pickup in store could have been better, but think this was a "Store specific" thing. 04 December 2011
    Rated 5 out of 5 by Worth every litre Castrol GTX is a leading product on its category and I always use it in my car. It gives me the result I expect and the peace of mind while I drive.. 23 October 2011
    Rated 5 out of 5 by Bargain Oil I usually have to get cheap supermarket oil which costs £7.99 for 1L. This was on offer at £10.00 for 4L and is a top branded product. Great bargain. 18 January 2012
    Rated 5 out of 5 by Excellent value Purchased this product from asda direct and chose to collect from store. It was ready for collection in a couple of days. Happy with my purchase. 29 December 2011
    Rated 5 out of 5 by Top value, full marks for selling this product Came across the offer while searching the net, so i was aware of the product and was pleased to buy two 4l containers whilst the offer lasted. 22 January 2013
    Rated 5 out of 5 by top product This was a great oil at a great price from Asda. The service was great from start to finish. will use Asda again. very impressed. Thanks 24 November 2011
    Rated 5 out of 5 by Castrol GTX 10W-40 A3B4 wow what a great item great price and a great service from asda they went out of there way to help so would go back to them again 26 January 2012
    Rated 5 out of 5 by Excellent Price & Service Top brand at excellent price, got them delivered to the local store. Even turned up 1 day earlier ! Would use again. 27 July 2012
    Rated 5 out of 5 by Excellent price! Does what it says on the tin - great quality oil, and at this excellent price you'd be a fool not to stock up! 12 January 2013
    Rated 5 out of 5 by Great price Great value at half the price, normally have to pay £20 plus for this. Deliverey to the store was very quick 01 January 2012
    Rated 5 out of 5 by Great Oil, Great Price I bought this at a bargain price that it usually is from ASDA. Great oil for my MK1 Golf. Why pay more? 09 February 2012
    Rated 5 out of 5 by Fantastic value Purchased this for £12 a bottle, amazing value and will keep my beautiful Scooby satisfied for a while! 23 July 2012
    Rated 5 out of 5 by Great service Easy to order, easy to pay, easy to collect! Excellent service, would recommend and will use again. 31 December 2011
    Rated 5 out of 5 by best for price bought this on offer at 12 pound for 4 litres - excellent value and good for my scooby too 17 July 2012
    Rated 5 out of 5 by great price What can i say excellent price excellent service a top oil at a bargain price 18 January 2013
    Rated 5 out of 5 by stunning value To find such a good deal on a quality motor oil was great. Well done Asda 27 November 2011
    Rated 5 out of 5 by Good Stuff Unbelievable price and great product! Castrol GTX - what more can i say! 06 December 2011
    Rated 5 out of 5 by Great quality and very cheap saved ten pound off normal purchase price, excellent bargain by asda! 09 December 2011
    Rated 4 out of 5 by oil wet and oily. Best place to put it. In the engine of your car. 30 May 2014
    Rated 5 out of 5 by Good purchase Perfect product.Best price and arrived quickly.Thank you Asda 27 December 2011
    Rated 5 out of 5 value for money Top value offer. 50% less than price some places! Recommend. 10 June 2013
    Rated 5 out of 5 by Its Oil Its Oil ! Cheaper than anywhere else and Castrol quality. 08 August 2012
    Rated 5 out of 5 by very good purchase It is a great product and also price was the BEST***** 28 July 2012
    Rated 5 out of 5 by Best purchase ever great oil, bargain price. 26 more characters should co 18 January 2012
    Rated 5 out of 5 bargain price 12£ must have been a mistake at this price it is now 20£ 14 August 2012
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