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Performance Engine Oils
Castrol MAGNATEC 10W-40 A3/B4 Car Engine Oil

Castrol MAGNATEC 10W-40 A3/B4 Car Engine Oil


Castrol Magnatec 10w-40 - 1 Litre

1 Litre


Castrol Magnatec 10w-40 - 4 Litres

4 Litres


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol MAGNATEC 10W-40 A3/B4 Car Engine Oil

General Details:

OilPart Synthetic Oil
Oil Viscosity Classification SAE10W-40
Packing TypeBottle
Content [litre]4
Manufacturer ApprovalFIAT 9.55535-D2
Manufacturer ApprovalMB 226.5
Manufacturer ApprovalRenault RN 0700
Manufacturer ApprovalRenault RN 0710
Manufacturer ApprovalVW 501 01 / 505 00
SpecificationACEA Light Duty A3/B
SpecificationAPI Gasoline SN

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Castrol MAGNATEC 10W-40 A3/B4 is a cutting-edge car engine oil designed to offer maximum performance in modern driving conditions. Setting out to create a solution for the stop-start driving that’s a common feature of city roads, Castrol created their MAGNATEC technology. Containing unique DUALOCK molecules, MAGNATEC oils cling to important engine parts and create a shield layer that provides ongoing protection, effective from the moment the engine starts up.

Where other engine oils will drain off elevated parts when the engine is idle, Castrol MAGNATEC oils with DUALOCK molecules act like a magnet and remain in place. And since up to 75% of engine wear occurs while the engine warms up, Castrol’s MAGNATEC oil formulation can reduce wear by up to 50%, extending the health of your engine. Suitable for use in both petrol and diesel engines, Castrol MAGNATEC 10W-40 A3/B4 is the perfect choice for drivers seeking an engine oil that offers the ultimate protection in stop-start driving conditions.

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  • DUALOCK molecules cling to engine parts and provide non-stop protection, effective from start-up
  • Specially formulated for stop-start driving conditions, such as those in cities
  • Reduces start-up engine wear, responsible for 75% of all engine wear, by up to 50%
  • Suitable for both petrol and diesel engines
  • Provides protection against engine wear in all driving conditions and temperatures
  • Extends peak engine performance by reducing the rate at which it wears


Castrol MAGNATEC 10W-40 A3/B4 meets the following specifications and approvals:

  • ACEA A3/B3, A3/B4
  • API SN
  • FIAT 9.55535-D2
  • MB-Approval 226.5
  • Renault RN 0700/0710
  • VW 501 01 / 505 00


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
Oil Type: Synthetic Technology

We say...

""Non-stop protection from every start""