Castrol MAGNATEC 10W-40 A/B Fully Synthetic Engine Oil 1L. Castrol MAGNATEC features DUALOCK molecules that cling to critical engine parts, reducing warm-up and stop-start wear by 50%. Offers patented protection designed for modern driving, forming a powerful force field. Suitable for gasoline and diesel engines with ACEA A3/B4, API SP 10W-40 recommendations. Approved for use in vehicles from leading manufacturers, meeting specifications including ACEA, API, Fiat, MB-Approval, and VW.