"Castrol MAGNATEC STOP-START 5W-30 A5 is a full synthetic engine oil formulated to protect and clean your engine with Castrol MAGNATEC intelligent molecules designed to cling to your engine like a magnet, providing an extra layer of protection. Castrol MAGNATECs unique formulation protects from the moment you turn the key, dramatically reducing engine wear. Now with ultra-refined molecules, for protection you can see, hear and feel. It is more common than ever that a driver can stop and start as many as 18,000 times a year. Continued idling stop/start driving causes microscopic wear to your engine internals and components. In the latest industry standard test, Castrol MAGNATEC STOP-START 5W-30 A5 gives significantly less wear in stop-start operation while offering continued protection for the life of the oil. Castrol MAGNATEC STOP-START 5W-30 A5 is suitable for use in automotive petrol and diesel engines where the manufacturer recommends an API SN, ACEA A1/B1, A5/B5, ILSAC GF-4 or earlier specification 5W-30 lubricant. MAGNATEC STOP-START A5 also meets Ford WSS-M2C913-C/D specifications."