| abstract |
PROBLEM TO BE SOLVED: To provide a bearing oil suitable as an oil-impregnated bearing oil composition for a bearing, particularly a sintered alloy bearing, in which the coefficient of friction is reduced and wear resistance, high-temperature stability and compatibility with bearing materials are improved. Providing a composition. SOLUTION: A dimer or more obtained by condensing (A) OH group-containing fatty acids with each other or a OH group-containing fatty acid and a OH group-free fatty acid in a base oil composed of a synthetic oil containing a polyolefin as a main component. A bearing oil composition characterized by blending an ester of estrid, which is an oxyfatty acid oligomer, with (B) alcohol, and particularly having a polyolefin content of 70% by weight or more based on the entire base oil. |