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Performance Engine Oils
Castrol Classic GP50 Low Detergent SAE 50 Monograde Engine Oil

Castrol Classic GP50 Low Detergent SAE 50 Monograde Engine Oil


Castrol Classic GP50 - 1 Litre

1 Litre


Castrol Classic GP50 - 1 Gallon (4.54L)

1 Gallon (4.54L)


Castrol Classic GP50 - 20 Litres

20 Litres


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol Classic GP50 Low Detergent SAE 50 Monograde Engine Oil

Castrol Classics from Opie Oils

Castrol Classic GP50 is, broadly speaking, for pre-1950 performance cars and pre-1970 motorcycles

Castrol Classic GP50 is a traditional, low detergent SAE 50 monograde engine oil, which offers excellent high temperature performance, excellent noise suppression and a very high level of engine wear protection.

Castrol Engine Oil

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  • Noise suppression
  • High temperature performance
  • Very high engine wear protection


  • 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...

    "For pre-1950 performance cars and pre-1970 motorcycles"