| abstract |
The present invention provides a transmission oil composition that has improved friction coefficient and wear prevention performance as compared with the prior art, and that suppresses a decrease in the friction coefficient between metals due to oxidative degradation after running. SOLUTION: In a base oil, (A) an oil-soluble molybdenum compound is 0.03 to 0.1% by mass in terms of molybdenum, (B) an antioxidant is 0.01 to 2% by mass, and (C) a metal detergent is 0.01% in terms of metal. ~ 2 mass%, (D) 0.005-0.05 mass% boron-containing ashless dispersant as boron content, and (E) 0.01-0.1 mass% phosphorous extreme pressure agent as phosphorus content A transmission oil composition. [Selection figure] None |