| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lubricating oil composition having an excellent heat resistance and extreme pressure properties even at high temperature and under high pressure, preventing generation of a sludge and usnable for a hydraulic circuit, a bearing, an industrial gear, a lubricating oil for a sliding face, etc. SOLUTION: This lubricating oil composition is obtained by dissolving or dispersing (A) 0.1-5.0 mass % of a phosphoric ester, a thiophosphoric ester or their amine salts, (B) 0.01-1.0 mass % of a phosphite or its amine salt and (C) 0.01-2.0 mass % of an alkenylsuccinimide, an alkenylsuccinic ester, benzylamine or their derivatives into a base oil. |
