| abstract |
A lubricating oil composition comprising (A) a base oil containing 3 % by weight or less of aromatics, 20 % by weight or more of monocyclic naphthenes, 50 ppm by weight or less of N and 50 ppm by weight or less of S, having a viscosity (100 °C) of 2 to 50 mm2/s, (B) alkyldiphenylamines and/or phenyl-α-naphthylamines in an amount of 0.05 to 2 % by weight of the total weight of the composition, and (C) C8-23 MoDTC and/or C8-18 MoDTP and/or C8-18 MoDTX in such an amount that the amount of Mo is 50 to 2000 ppm by weight of the total weight of the composition. The lubricating oil composition has high heat resistance, high oxidation stability and excellent lubricating properties, and is particularly useful for a lubricating oil for internal combustion engines and the like. |