| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbine oil composition excellent in biodegradability, having a low flow point and excellent in thermal oxidation stability.SOLUTION: A turbine oil composition contains (A) a complex ester containing a polyvalent alcohol residue, a straight chain saturated fatty acid residue and a straight chain polycarboxylic acid residue, and having a kinetic viscosity at 40°C of 20 to 100 mm/s and a flow point of -40°C or lower, and (B) an antioxidant. A content ratio of (A) in a base oil is 60 mass% or more. |
