Patent ID: 8642517

Claim:
A lubricating oil composition comprising: a lubricating base oil including a lubricating base oil component having a urea adduct value of 4% by mass or less, a kinematic viscosity of 25 mm 2 /s or less at 40° C. and a viscosity index of 120 or greater, and comprising a saturated component that contains cyclic and acyclic components, wherein the saturated component content is 90% or greater based on the total weight of the lubricating base oil, and wherein the proportion of cyclic saturated components among the saturated components is 0.1 to 50%, and wherein the amount of the lubricating base oil component is 10 to 100% by mass based on a total mass of the lubricating base oil; and a poly(meth)acrylate based viscosity index improver including a structural unit represented by general formula (1): wherein R 1 represents hydrogen or a methyl group, and R 2 represents a straight or branched hydrocarbon group with 16 or more carbon atoms, and wherein the proportion of the structural unit represented by general formula (1) is 0.5 to 70% by mole, the lubricating oil composition having a kinematic viscosity of 4 to 12 mm 2 /s at 100 ° C. and a viscosity index of 140 to 300.