Patent ID: 8445418

Claim:
A lubricating oil composition, comprising: a base oil having a viscosity index of 120 or more; and a first polymer having a mass average molecular weight of less than 100,000 in an amount of 0.01 mass % to 10 mass % relative to a total amount of the lubricating oil composition, and a second polymer compound having a mass average molecular weight of 100,000 or more in an amount of less than 0.5 mass % relative to the total amount of the lubricating oil composition, wherein a viscosity index of the lubricating oil composition is 130 or more, and wherein the first polymer compound comprises (a) at least one of olefin copolymer of a mass average molecular weight of 4,700 or more and 7,000 or less and polymethacrylate of a mass average molecular weight of 26,000 or more and 45,000 or less, and (b) polymethacrylate of a mass average molecular weight of 69,000 or more and less than 100,000.