Wolf's Head Super Duty Motor Oil 20W50. Super-Duty Motor Oils are multi-viscosity oils that provide superior engine protection no matter that the operating temperature. Wolf’s Head Super-Duty Motor Oils protect domestic and imported vehicles and equipment powered with either gasoline or diesel engines even those that are turbo-charged or super-charged equally well. This high quality oil has been specifically formulated to meet or exceed all new car manufacturers' warranty requirements as well as the stringent industry standards API SM/CF - ILSAC GF-4 and ACEA A5/B5, A3/B4, A3/B3, A1/B1 / C3, C2 and C1. These oils are also formulated to exceed the standard for the Thermal Engine Oil Stability Test (TEOST MHT) and the Ford M2C 930-A, whichsupersedes M2C153-H requirements. Wolf's Head Super-Duty will protect with equal vigor both new, modern, close tolerance engines and older, high-mileage engines running in a wide range of operating temperatures and conditions. These high performance motor oils exceed the stringent lubricating performance requirements of American, European, Korean, Japanese and other worldwide engine manufacturers.12 packs. 20W-50