LUBRICATING OIL COMPOSITION

摘要

Disclosed is a lubricating oil composition which comprises a lubricant base oil comprising a mineral-oil-type base oil and/or a synthetic base oil, a metal salt (A) of a phosphorus-containing acid represented by the general formula (a) or (b), a metal-containing detergent (B) and an ashless dispersant (C), wherein the metal salt (A) is contained in the composition in an amount of 0.01 to 0.2 mass% in terms of the phosphorus content, the metal-containing detergent (B) is contained in the composition in an amount of 0.005 to 0.5 mass% in terms of the metal content, and the ashless dispersant (C) is contained in the composition in an amount of 0.01 to 0.4 mass% in terms of the nitrogen content, all relative to the total amount of the composition. The lubricating oil composition can be used in a wet clutch or a four-cycle engine for a two-wheel vehicle, and has an excellent power transfer capability in a wet clutch and/or a reduced fuel-economy rating.