| abstract |
Provided is a lubricating oil composition having a high coefficient of static friction of a wet clutch, excellent friction characteristics of a power transmission mechanism, and excellent fuel efficiency, and suitable as a lubricating oil for power transmission and an engine lubricating oil. To do. A lubricating base oil, (A) an organomolybdenum compound, (B) a zinc dialkyldithiophosphate, (C) at least one selected from Ca sulfonate, Ca phenate and Mg sulfonate having a base number of 230 mgKOH / g or more. And (D) a boron-containing ashless dispersant or a combination of a boron-containing ashless dispersant and a non-boron-containing ashless dispersant, respectively, in a predetermined ratio, and in the composition, the P content and the Mo content. The mass ratio (P / Mo) is 1.5 or more, the total content of Ca and Mg derived from the component (C) and the mass ratio of Mo content (CaMg / Mo) is 3 or more, and (D) A lubricating oil composition having a component-derived B / N mass ratio of 0.5 or more is used. [Selection figure] None |