Method for improving copper corrosion performance
AssigneeChevron Oronite Company LLC
InventorsKenneth D. Nelson, Elaine S. Yamaguchi, Kam-Sik Ng, Paula S. Rogers
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Abstract
Disclosed is a method for improving copper corrosion performance of a lubricating oil composition containing (a) a major amount of a base oil of lubricating viscosity; and (b) one or more dispersants containing one or more basic nitrogen atoms. The method involves adding to the lubricating oil composition an effective amount of one or more copper corrosion performance improving agents of the general formula Si—X4 or a hydrolysis product thereof, wherein each X is independently a hydroxyl-containing group, hydrocarbyloxy-containing group, acyloxy-containing group, amino-containing group, monoalkyl amino-containing group or dialkyl amino-containing group.
Claims18
A method for improving copper corrosion performance in an internal combustion engine operated with a lubricating oil composition comprising (a) a major amount of a base oil of lubricating viscosity;
- and (b) a dispersant mixture comprising (i) a borated bissuccinimide, (ii) an ethylene carbonate post-treated bissuccinimide and (iii) a polysuccinimide, the method comprising (i) adding to the lubricating oil composition an effective amount of one or more copper corrosion performance improving agents of the general formula Si—X4 or a hydrolysis product thereof, wherein each X is independently a hydroxyl-containing group, hydrocarbyloxy-containing group, acyloxy-containing group, amino-containing group, monoalkyl amino-containing group or dialkyl amino-containing group, and (ii) lubricating an internal combustion engine in need of improved copper corrosion performance with the lubricating oil composition.
Dependencies are inferred from the claim text.