Search Button


Account Button


Basket Button

Basket Basket

Search Suggestions



View All Results

Performance Engine Oils
Castrol ST90 Monograde SAE90 Mineral Gear Oil

Castrol ST90 Monograde SAE90 Mineral Gear Oil


Castrol ST90 SAE90 gear oil - 1 Litre

1 Litre


Checking Stock



Add To Basket

  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol ST90 Monograde SAE90 Mineral Gear Oil

Castrol ST90 is a monograde SAE90 gear oil formulated with high quality mineral oils. Castrol ST90 is fortified with anti-oxidant and anti-wear additives to ensure that the oil is able to withstand the oxidising conditions which will be present in the gearbox during service.

Castrol ST90 is suitable for the lubrication of most types of gear including helical, spur, bevel and worm but most not be used for hypoid gears which require extreme pressure lubricants.

Castrol ST90 is not suitable for applications where MIL-L-2105A/B/C are specified.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • High quality mineral oil
  • Withstands oxidisation


  • Specifications
    • SAE90
    • API GL3


    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.

    Share this product:

    Find Oils & Parts

    Use Our Product Lookup

    We say...

    "Suitable for the lubrication of most types of gear including helical, spur, bevel and worm."