| abstract |
PROBLEM TO BE SOLVED: To disclose a lubricating oil composition having long-term emission characteristics as evidenced by improved wear, extreme pressure and oxidation performance. The present invention relates to a lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of each of the following components: a) from about 3.0 to about 7.0 wt. Ash dispersant, b) from about 2.0 to about 5.0% by weight of a borated ashless dispersant, wherein the weight ratio a / b is from about 0.3 to about 0.5; 1.0 to about 3.0% by weight of a highly overbased metal-containing detergent, d) about 0.1 to about 2.0% by weight of a phosphorus-containing compound, provided that the weight of total phosphorus in the lubricating oil composition % Is no more than 0.08% by weight based on the total weight of the lubricating oil composition. [Selection diagram] None |