abstract |
Lubricating oil composition that has excellent seizure resistance and fatigue resistance such as FZG micropitting resistance, and has sludge generation suppressed in an oxidation test. A base oil, (A) an alkyl acid alkyl ester having 6 to 20 carbon atoms in an alkyl group, (B) a dialkylamine and / or a trialkylamine, and (C) (c-1) ) Sulfur compounds that do not contain -S-S-S- or higher polysulfur bonds in the molecule and have an S content in the molecule of 15% by mass or more are defined as 0.2 to 0.6% by mass and S In some cases, (c-2) represented by the general formula (I) (R—O—) 3 P═S (I) (wherein R represents a hydrocarbyl group having 6 to 20 carbon atoms). It is a lubricating oil composition comprising 0.1 to 1.0% by mass of thiophosphate trihydrocarbyl ester and having a P content of 150 to 500 ppm by mass in the composition. [Selection figure] None |