| 摘要 |
<p>A lubricating oil composition which comprises a lube base oil, (A) an organomolybdenum compound, (B) zinc dialkyldithio- phosphate, (C) at least one member having a base number of 230mgKOH/g or above, selected from among calcium sulfonates, calcium phenates and magnesium sulfonates, and (D) a boron-containing ashless dispersant or a combination thereof with a boron-free ashless dispersant in prescribed proportions respectively and in which the P/Mo content ratio is 1.5 or above by mass, the CaMg/Mo mass ratio of the total content of Ca and Mg resulting from the component (C) to the content of Mo is 3 or above, and the mass ratio of B/N resulting from the component (D) is 0.5 or above. The lubricating oil composition attains a high coefficient of static friction of a wet clutch and excellent friction characteristics of a power transmission mechanism as well as excellent fuel-saving characteristics, thus being useful as the lubricating oil for both power transmissions and engines.</p> |
