Abstract: A lubricating oil composition is provided which is obtained by containing in (A) a base oil in which the content of the aromatic ingredients is 3.0% by weight or less, N is 50 ppm by weight or less, S is 50 ppm by weight, and the viscosity is 2.0-50.0 mm.sup.2 /s, based on the total weight of the composition, (B) 0.05-2.0% by weight of alkyldiphenylamine(s) and/or phenyl-.alpha.-naphthylamine(s) and (C) MoDTC of C.sub.8-23 and/or C.sub.3-18 in an amount of 50-2,000 ppm by weight in terms of the amount of molybdenum. Such a lubricating oil composition has high heat-resistant properties, a high stability to oxidation, and improved friction characteristics, and is suitably used especially as a lubricating oil for internal combustion engines.