Castrol 60038 GTX MAGNATEC 5W-20 Full Synthetic Motor Oil, 6 Gallon Enviro-Pack 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 Keeps critical parts up to 4X smoother.* *As tested in the industry Sequence IVA wear test Intelligent molecules cling to protect from the moment you start API SN, ILSAC GF-5, dexos 1  dexos1 is a registered trademark of General Motors, Meets Ford WSS-M2C930-A, Ford WSS-M2C945-A Castrol recommends the use of Bosch oil filters