Castrol Magnatec 5W-30 C2 is suitable for use in automotive gasoline and diesel engines where the manufacturer recmmends an ACEA C2, API SN or earlier specification 5W-30 lubricant Castrol Magnatec 5W-30 C2 is approved for use in vehicles that require a PSA B71 2290 5W-30 lubricant. Up to 75% of engine wear happens while your engine warms up. When the engine stops oils drain off critical engine parts, however Castrol MAGNATECs intelligent molecules dont. They cling to the engine like a magnet providing an extra layer of protection. Castrol MAGNATECs unique formulation protects from the moment you start, dramatically reducing engine wear. Now with ultra-refined molecules, for protection you can see, hear and feel.