abstract |
[Problem] To provide a lubricating oil composition for hydraulic oil that has extremely excellent temperature-viscosity characteristics and is also excellent in thermal oxidation resistance and stability. [Solutions] 10 to 99% by mass of a lubricating base oil (A) having a kinematic viscosity at 100° C. of 1 to 14 mm 2 /s, a viscosity index of 100 or more, and a pour point of 0° C. or less, and a specific catalyst. Contains 90 to 1% by mass of a liquid random copolymer (B) of ethylene and α-olefin (the sum of (A) and (B) is 100% by mass), and has a kinematic viscosity at 100°C of 10 to 300 mm 2 /s lubricating oil composition for hydraulic oil. |