Castrol 03057 GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart, 3 Pack Dramatically reduce engine wear Leave critical engine parts 4X smoother* * As tested in the industry Sequence IVA wear test Superior wear protection on critical engine parts Unsurpassed level of protection against viscosity breakdown Unique full synthetic technology to fight against harmful sludge build-up High level of fuel economy based on US industry standards API SN; ILSAC GF-5; GM dexos1; Meets Ford WSS-M2C929-A; Meets Ford WSS-M2C946-A; Meets the performance of GM 6094M Castrol recommends the use of Bosch oil filters