Engine oil composition

An engine oil composition comprising:

• (a) a base oil having a kinematic viscosity of from 2 to 8 mm.sup.2 /s at 100.degree. C. and a total amount of aromatics of 2 to 15% by weight;
• (b) calcium salicylate detergent in an amount of from 0.5 to 1.2% by weight as converted to the concentration of sulfated ash;
• (c) a zinc dialkyldithiophosphate in an amount of from 0.04 to 0.10% by weight as converted to the concentration of phosphorus;
• (d) a succinimide ashless dispersant in an amount of from 0.05 to 0.20% by weight as converted to the concentration of nitrogen, the succinimide ashless dispersant containing a polybutenyl group having a number-average molecular weight of from 900 to 3500;
• (e) a phenol ashless antioxidant in an amount of from 0.1 to 3.0% by weight;
• (f) a molybdenum dithiocarbamate friction modifier in an amount of from 0.02 to 0.15% by weight as converted to the concentration of molybdenum;
• and
• (g) a viscosity index improver in such an amount that the kinematic viscosity of said composition ranges from 5.6 to 12.5 mm.sup.2 /s at 100.degree. C. and selected from the group consisting of ethylene-propylene copolymer, polymethacrylate, graft copolymer of ethylene-propylene copolymer and polymethacrylate and mixtures thereof of ethylene-propylene copolymer and polymethacrylate, said improver having a molecular weight range of from 50,000 to 1,000,000;
• wherein the weight percentages in the components (b), (c), (d), (e) and (f) are based on the total weight of said engine oil composition.