Method for improving copper corrosion performance
AssigneeCherron 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 containing one or more oil-soluble titanium compounds.
Claims21
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;
- (b) one or more dispersants containing one or more basic nitrogen atoms;
- and (c) a zinc dialkyl dithiophosphate, the method comprising (i) adding to the lubricating oil composition an effective amount of one or more copper corrosion performance improving agents comprising one or more oil-soluble titanium compounds, and (ii) lubricating an internal combustion engine in need of improved copper corrosion performance with the lubricating oil composition, wherein the amount of the one or more copper corrosion performance improving agents comprising one or more oil-soluble titanium compounds is from about 1680 ppm to about 14000 ppm as Ti metal, based on the total weight of the lubricating oil composition.
Dependencies are inferred from the claim text.