| abstract |
[PROBLEMS] To provide a lubricating oil composition for gears that has excellent low-temperature fluidity without reducing the viscosity of the lubricating oil, has wear resistance and oxidation stability that can reduce fuel consumption, and has excellent fatigue life. To provide. SOLUTION: A copolymer of a lubricating base oil having a kinematic viscosity at 40 ° C. of 140 to 350 mm 2 / s, an α-olefin and an ester monomer having a polymerizable unsaturated bond, phosphorus and sulfur. Provided is a lubricating oil composition for gear oil, comprising a performance additive containing, and a poly (meth) acrylate pour point depressant. [Selection figure] None |