| abstract |
Provided is a lubricating oil composition containing (A) 70 to 95 mass% of a poly-α-olefin base oil, (B) 5 to 20 mass% of an ester-based base oil, and (C) an ester-based defoaming agent. The (A) poly-α-olefin base oil is a C 8-12 α-olefin polymer. The lubricating oil composition maintains excellent defoaming performance over a long period of time and is suitable as a step-up gear oil composition for wind power generation. |