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Performance Engine Oils
Castrol Classic XXL40 High Quality Monograde Engine Oil

Castrol Classic XXL40 High Quality Monograde Engine Oil


Castrol Classic XXL40 - 1 Litre

1 Litre


Castrol Classic XXL40 - 1 Gallon (4.54L)

1 Gallon (4.54L)


Castrol Classic XXL40 - 20 Litres

20 Litres


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  • Description
  • Specifications
  • Shipping Explained

Castrol Classic XXL40 High Quality Monograde Engine Oil

Castrol Classic XXL40 is a high quality, Low detergency traditional mono grade engine oil for single and multi-cylinder engines that pre date 1950 in cars and pre date 1970 for motorcycles, this oil can cope with both road and competition conditions. Unlike modern engine oils, this Castrol classic lubricant is low detergency, this can be essential for any un-restored or unknown condition engines where deposits may be sealing the engine block, a high level of detergency could removing these deposits and may cause oil leaks and potentially loosen internal debris into oil circulation blocking oil ways.

Castrol Classic XXL 40 must not be mixed with either Castrol R40 or any other synthetic or castor/synthetic based oils.


  • Veteran, vintage and classic cars / bike that require SAE 40 lubricant
  • For petrol engines pre dating 1950 in Cars & 1970 in Motorcycles
  • Suitable for both engine and some gearbox use
  • For year round, road and competition conditions
  • Winter use in engines which would otherwise have high oil consumption
  • Summer use in twin-cylinder 4-stroke engines

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • Specifications
    • API SB


    SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
    We've tried to keep all other shipping costs as low as we can.

    Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

    • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
    • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
    • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
    • Priority shipping is also available.

    How long will it take to get my order?

    We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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    Brand: Castrol Classic Oils
    Oil Type: Mineral

    We say...

    "A high quality monograde engine oil recommended for single and multi-cylinder engines under both road and competition conditions"