| abstract |
The present invention provides a lubricating oil composition having excellent oxidation stability, extreme pressure performance and friction characteristics, and excellent electrical insulation. [Solution] (A) 0.2 mass% to 0.6 mass% of an ashless dispersant based on the total mass of the lubricating base oil and the lubricating oil composition, (B) 0.7 to 6.0% by mass of at least one compound selected from the group consisting of triaryl phosphates, trialkyl phosphates and triaryl thiophosphates, and (C) 0.01 to 0.08% by mass At least one compound selected from the group consisting of an acidic phosphate represented by the following formula (I) or (II) and an amine salt thereof and a phosphite represented by the following formula (III): RO-P (= O) (OH) 2 (I) (RO) 2 P (═O) (OH) (II) (RO) 2 P (═O) H (III) [Wherein, each R is independently an aliphatic hydrocarbon group having 6 to 18 carbon atoms] And a sulfur-based extreme pressure agent is not contained. [Selection figure] None |