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Castrol Outboard 4T 10W-30 Semi Synthetic Boat Engine Oil

Castrol Outboard 4T 10W-30 Semi Synthetic Boat Engine Oil


Castrol Outboard 4T - 1 Litre

1 Litre


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol Outboard 4T 10W-30 Semi Synthetic Boat Engine Oil

Castrol Outboard 4 stroke Boat / Marine Engine Oil is a high performance lubricant with a part synthetic formulation, it provides the highest levels of engine protection over a wide range of operating conditions. This oil has been specially designed to tackle the unique stresses and strains of a boat / marine engine, such as extended idle times to high revving cruising for long periods.

This Castrol Boat engine oil offers enhanced piston cleanliness and reduced oil consumption, excellent low temperature wear control for effective valve train protection, high resistance to viscosity losses allowing a thick oil film to be maintained over time, even in the presence of high levels of fuel dilution and good anticorrosion properties for safe protection during winter storage.

Castrol Outboard 4T has been designed for all 4 stroke outboard engines from major Japanese and American manufacturers.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • Benefits:
    • Part synthetic formulation
    • Highest levels of engine protection
    • Enhanced piston cleanliness
    • Reduced oil consumption
    • Excellent low temperature wear
    • Valve train protection
    • Anticorrosion properties
    • Safe protection during winter storage


  • Specifications:
    • API SL
    • API CF


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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"Synthetic Based 4T Boating Engine Oil"

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