LUBRICATING OIL COMPOSITION

摘要

Disclosed is a lubricating oil composition comprising: a lubricating base oil having a kinematic viscosity at 100° C. of 3.5 to 4.5 mm2/s, a viscosity index of 145 or greater, and an urea adduct value of 2 to 7% by mass; and a poly(meth)acrylate pour-point depressant containing structural units represented by the formula (1):;;wherein R1 represents a hydrogen atom and the like, R2 represents an alkyl group; based on the total amount of the units contained in the depressant, a ratio of the units wherein the R2 is a methyl group is 0 to 10 mol %, a ratio of the units wherein the R2 is an alkyl group having 12C or greater is 90 to 100 mol %; the alkyl group having 12C or greater has an average number of 13-16C; the depressant has a weight-average molecular weight of 10,000 to 200,000.

主权项

1. A lubricating oil composition comprising:
a lubricating base oil having a kinematic viscosity at 100° C. of 3.5 to 4.5 mm2/s, a viscosity index of 145 or greater, and an urea adduct value of 2 to 7% by mass; and a poly(meth)acrylate pour-point depressant containing structural units represented by the following formula (1): wherein in the formula (1), R1 represents a hydrogen atom or a methyl group, and R2 represents an alkyl group; based on the total amount of the structural units represented by the formula (1) contained in the poly(meth)acrylate pour-point depressant, a ratio of the structural units represented by the formula (1) wherein the R2 is a methyl group is 0 to 10 mol %, and a ratio of the structural units represented by the formula (1) wherein the R2 is an alkyl group having 12 or greater carbon atoms is 90 to 100 mol %; the alkyl group having 12 or greater carbon atoms in the poly(meth)acrylate pour-point depressant has an average number of carbon atoms of 13 to 16; and the poly(meth)acrylate pour-point depressant has a weight-average molecular weight of 10,000 to 200,000.