| 主权项 |
1. A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and:
(a) a sulfurised fatty acid ester derived from a fatty acid ester of palm oil, soya oil, tallow oil or a mixture of palm oil, soya oil and tallow oil ester having an olefinic content of from about 40 to about 100 mass %, and comprising from about 5 to about 20 mass % sulfur; in an amount providing said lubricating oil composition with from about 0.05 to about 0.3 mass % of sulfur, (b) one or more a primary antioxidants selected from the group consisting of antioxidant is one or more of the group comprising aromatic amines, hindered phenols, hindered bisphenols, dialkyldithiocarbamates and phenothiazines, (c) a dihydrocarbyldithiophosphate metal salt in an amount providing said lubricating oil composition with from about 0.01 to about 0.12 mass % of phosphorus, and (d) an oil soluble organomolybdenum compound, in an amount providing said lubricating oil composition with from about 2 to no more than 50 ppm of molybdenum to the composition. |
