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

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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 5 out of 5 by Great value for great product very cheap for what it is and seems to work well in a range of vehicles, for example i use it for both my car and bike. 07 July 2012
    Rated 5 out of 5 by A Stockup Must If you car is lucky to use 10/40 semi oil This is one of the best you can get for price been Castrol its a well known brand It works perfectly fine in my little italian engine, ordered 4 as at £10, its something you cant miss out on when its £20 a bottle else where Happy and fast service :) 17 December 2011
    Rated 5 out of 5 by does exactly what it says This was the cheapest site I could find selling this oil, my son is very please as he saved enough money to buy a new oil filter as wel. I will be looking at ASDA site for future purchases. Also it was easy to pick up from my local store whilst doing my weekly shop.l 28 July 2012
    Rated 5 out of 5 by Recommended and cheeeeap! This is a really good oil for my CBR600 and couldn't believe my luck when i found 4L of the stuff for only £10. Sorted! 03 February 2012
    Rated 5 out of 5 by 1 OF THE BEST BARGAINS At a tenner each i couldn't resist getting more than 1, what a bargain. Nice1 :) 30 November 2011
    Rated 5 out of 5 by Quality oil - good price Purchased 2 cans of this to do an oil change on my old Laguna - it takes about 5 - 6 litres of oil and needs an occasional top up so 2 x 4l cans are perfect. At £10 it is half the price that it sells on the shelf in asda for, and was in the next day ! 03 January 2012
    Rated 5 out of 5 by great purchase i was told about this offer on at asda for this castrol oil it was half price from 20 to 10 pounds i had to have it its well known that castrol is one of the best engine oils for your car or any vehicle welldone asda for selling it halfprice, 14 January 2012
    Rated 5 out of 5 by Bargain Motor Oil Half the price on-line than the instore price. The in store price is competitive compared to the usual car shops. The on-line price, £10, is great value. Long may this offer continue. Picked up in store and saved myself the delivery charge. 03 December 2011
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