Patent ID: 8361940

Claim:
A low sulfated ash, low sulfur, low phosphorus, low zinc, diesel engine lubricating oil composition which has a sulfated ash content of 0.1 to 1.1 wt. %, a sulfur content of 0.01 to 0.3 wt. %, a phosphorus content of 0.08 wt. % or lower, and a zinc content of 0.07 wt. % or lower, said diesel engine lubricating oil composition comprising: (a) a major amount of a mineral or synthetic base oil having a saturated component of 85 wt. % or more, a viscosity index of 110 or more, and a sulfur content of 0.01 wt. % or less; (b) an alkaline earth metal-containing detergent in an amount of 0.01 to 0.4 wt. % in terms of an alkaline earth metal content; (c) a nitrogen-containing ashless dispersant of a weight average molecular weight of 4,500 or more in an amount of 0.01 to 0.3 wt. % in terms of a nitrogen content; (d) at least one oxidation inhibitor in an amount of 0.1 to 5 wt. %, selected from the group consisting of a phenolic oxidation inhibitor and an amine oxidation inhibitor; and (e) a basic nitrogen-containing compound-oxymolybdenum complex in an amount of 0.3 to 2.0 wt. %, and wherein the diesel engine lubricating oil composition contains no zinc dialkyldithiophosphate.