Castrol Magnatec 10W-40 A3/B4 Synthetic Engine Oil MB-Approved 226.5 - 2x2Litres - ALL OILS

Castrol Magnatec 10W-40 ACEA A3/B4 Synthetic Engine Oil API SN MB-Approved 226.5 - 2 x 2 Litres (4L)

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Standard Next Day Delivery - £5.99
FREE UK Delivery on orders over £75 *excluding Tanks*

Order before 2pm for next day delivery. May take up to 72 hours.

Traffic congestion has increased dramatically; today even a normal driver can stop and start up to 18,000 times a year*. That’s annoying, but worse, it slowly damages your engine – permanently.
Uniquely, Castrol’s breakthrough MAGNATEC DUALOCK molecules cling to critical engine parts and lock together to:

  • Form a powerful force field of protection 
  • Dramatically reduce both warm-up** and stop-start wear by 50%*** 
  • Offer non-stop protection from every start.
Castrol Magnatec 10W-40 A3/B4 is from the updated Castrol Magnatec range car oil, equally suitable for petrol and diesel engines and replacing the separate Magnatec 10W-40 A3/B3 and Magnatec Diesel B3 engine oils.

* Global average from 50 cities, Castrol MAGNATEC STOP-START Index 2014
** Tested vs the API SN wear limit in the Sequence IVA test.
*** Tested versus the ACEA wear limit in the OM646LA test.


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


  • Exceeds the requirements of the ACEA A3 and B4 specifications
  • Provides protection for all driving styles and in all conditions
Castrol Magnatec’s DUALOCK Molecules;
  • Form a powerful force field of protection 
  • Dramatically reduce both warm-up and stop-start wear 
  • Offer non-stop protection from every start

Standard Next Day Delivery - £5.99 (Mainland UK only)
FREE Standard Delivery on all orders over £75 (Mainland UK only)
Orders made before 2pm are usually sent next day but can take up to 72 hours.

*At this time we do not offer international shipping

30 day returns policy – You may return an item within 30 days at your own expense unless the item received is wrong or damaged.