| abstract |
[Problem] To provide an industrial gear oil having extremely excellent temperature-viscosity characteristics and also excellent thermal oxidation stability. [Solutions] 10 to 90 mass % of a lubricating base oil (A) having a kinematic viscosity at 100 ° C. of 1 to 100 mm 2 /s, a viscosity index of 100 or more, and a pour point of 0 ° C. or less, and a specific catalyst. It contains 90 to 10 mass % of a liquid random copolymer (B) of ethylene and α-olefin (the sum of (A) and (B) is 100 mass %), and has a kinematic viscosity of 100 to 10,000 at 40°C. A lubricating oil composition for industrial gears, mm 2 /s. |