| abstract |
PROBLEM TO BE SOLVED: To provide a hydraulic oil having excellent antioxidant properties, thermal stability, preventing the generation of sludge, and having excellent fuel saving, wear resistance, anti-seizure property, etc. under low viscosity, Providing lubricating oil compositions that can be used for gear oils, engine oils (diesel, gazoline, gas), etc. A base oil comprising a mineral oil, a synthetic oil or a mixture thereof is added to 100% by weight of a lubricating oil composition. (A) one or more metal detergents selected from a divalent metal salt of salicylic acid or sulfonic acid with or without an alkyl substituent, or a phenate of a divalent metal, 0.3 to 5.0% by weight, (B) fatty acid ester 0.3 to 5.0 wt%, and (C) zinc dialkyldithiophosphate 0.3 to 5.0 wt%, A lubricating oil composition having oxidation stability characterized by comprising [Selection figure] None |