Patent ID: 7838470

Claim:
A multigrade crankcase lubricating oil composition having a sulfated ash content of at least 0.2 mass %, comprising, or made by admixing: (A) a major amount of oil of lubricating viscosity, at least 50% by mass of which is Group III mineral oil, and no greater than 25% by mass of which is a Group I, Group II or Group IV basestock; and minor amounts of: (B) a non-hydrogenated olefin polymer in an amount of 1 to 15 mass %, based on the mass of the oil composition, said polymer having a number average molecular weight in the range of 100 to 5,000; (C) a dispersant; (D) a metal detergent; (E) one or more other lubricant additive components selected from anti-oxidants, anti-wear agents and friction modifiers, and (F) a viscosity modifier.