| 摘要 |
A lubricating oil composition contains: an ester as a base oil formed from a dibasic acid having a carbon number of 9 to 12 and a primary alcohol having a side chain and a carbon number of 8 to 13; and an alkyl(metha)acrylate polymer having an SP (solubility parameter) value of 9.2 or higher and a mass average molecular weight of 1x10<SUP>5 </SUP>to 1x10<SUP>6</SUP>, the alkyl(metha)acrylate polymer being contained in an amount of 0.5 to 10 mass % of a total amount of the composition. A viscosity of the composition at 100° C. is 9.3 to 11.5 mm<SUP>2</SUP>/s. |
