| 摘要 |
<p>Provided is a lubricating oil composition with low molybdenum content and excellent friction reduction. The composition comprises in a lubricant base oil: (A) the phosphate metal salt represented by formula (1) and (B) an organomolybdenum compound wherein the ratio of molybdenum atoms to sulfur atoms is at least 1:3.5. (In the formula, R1 to R4 represent an optionally same or different C1 - 30 hydrocarbon group, C1 - 30 alkyl or alkenyl group, or a C1 - 30 alkyl-containing alkyl thioethyl group; X1, X2, X3, and X4 each represent a sulfur or oxygen atom wherein either X1 or X2 is an oxygen, or both are oxygen, and either X3 or X4 is an oxygen or both are oxygen; and Y represents a metal element.)</p> |
