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US 7,285,516 B2Granted
Additive formulation for lubricating oils
AssigneeThe Lubrizol Corporation
InventorsVirginia A. Carrick, William D. Abraham, Gordon D. Lamb, R. Ian Wilby, James P Roski
Life of this patent
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Abstract
Lubricating oils containing an additive formulation including at least one sulphonate, saligenin and salixarate detergent provide improved wear performance and decreased sulphur and phosphorus emissions.
Claims17
A method of lubricating a compression-ignited internal combustion engine, comprising supplying thereto a lubricant composition comprising:
- (a) about 0.05 to about 1.5 weight percent of a calcium or magnesium sulphonate detergent;
- (b) about 0.2 to about 2 weight percent of a calcium salixarate detergent;
- (c) about 0.2 to about 1.7 weight percent of a magnesium saligenin detergent;
- and
- (d) an oil of lubricating viscosity in an amount up to about 99.75 weight percent, wherein the composition has a total sulphur content of below about 0.5 weight percent and a total phosphorus content of below about 0.1 weight percent.
2 more elements
Dependencies are inferred from the claim text.