| 摘要 |
PURPOSE:To obtain an lubricating oil composition comprising a specific lubricating oil base oil, a specific diarylamine compound and a specific molybdenum compound in a specified ratio, excellent in heat resistance, oxidation stability, and low abrasion resistance, and suitable for internal combustion engines, etc. CONSTITUTION:This lubricating oil composition comprises (A) a lubricating oil base oil containing <=3wt.% of aromatic components, >=20wt.% of monocyclic naphthene components, <=50ppm of sulfur content and <=50ppm of nitrogen content, and having a viscosity of 2-50mm<2>/s at 100 deg.C, (B) one or more kinds of diarylamine compounds of formulas I (R<1> to R<4> are H, 1-18C hydrocarbon) and II (R<5>, R<6> are R<1>) in an amount of 0.05-3wt.% based on the whole weight of the composition, and (C) one or more kinds of molybdenum compounds of formulas III (R<7>, R<8> are 5-23C hydrocarbon; m+n=4), IV (R<9>, R<10> are 1-18C hydrocarbon; x +y=4), and V (R<11>, R<12> are 1-30C hydrocarbon; X, Y are O, S) in an amount of 50-2000ppm (as molybdenum) based on the whole weight of the composition. |
