LUBRICANT COMPOSITION

摘要

Disclosed is a lubricant composition containing a lubricant base oil having a kinematic viscosity at 100°C of 1-10 mm2/s, a %Cp of not less than 70 and a %CA of not more than 2, which composition also contains, based on the total amount of the composition, 0.01-10% by mass of a first viscosity index improver which is composed of a poly(meth)acrylate having a weight average molecular weight of not more than 100,000 and 0.01-50% by mass of a second viscosity index improver which is composed of a polymer having a weight average molecular weight of not less than 100,000 and containing a structural unit represented by Formula (1) in an amount of 0.5-70% by mole. The lubricant composition has a kinematic viscosity at 100°C of 4-12 mm2/s and a viscosity index of 140-300. [In Formula (1), R1 represents a hydrogen atom or a methyl group; and R2 represents a linear or branched hydrocarbon group having 16 or more carbon atoms or a linear or branched organic group containing an oxygen atom and/or a nitrogen group and having 16 or more carbon atoms.]