| abstract |
(57) [Summary] A lubricant that suppresses oxidation of lubricating oil, reduces tappet wear, and reduces deposits on valves and pistons. SOLUTION: About 50 to 1 molybdenum derived from a molybdenum compound which is oil-soluble and substantially does not contain reactive sulfur. 000, preferably 50 to 500 ppm, and about 1,000 to 20,000, preferably 1,0, From 2,000 ppm to 2,000 ppm of phenate. A lubricating oil composition containing 0 to 40,000 ppm is disclosed. Such a combination of materials improves the oxidation control of the lubricating oil and improves the deposit control. This composition is particularly suitable for use as a crankcase lubricant. |