High efficiency engine oil compositions
AssigneeChevron Japan Ltd.
InventorsHisanari ONOUCHI, Isao TANAKA
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Abstract
The present application pertains to a lubricating oil composition for an internal combustion engine that advantageously which exhibits improved fuel economy. The composition may comprise a major amount of oil of lubricating viscosity, an alkaline earth metal sulfonate detergent, and a comb-shaped polymethacrylate viscosity modifier. The compositions may be an 0W-8, an 0W-12, an 0W-16, or an 0W-20 SAE viscosity grade and be particularly useful for a hybrid vehicle.
Claims24
A lubricating oil composition for an internal combustion engine, comprising:
- a) a major amount of oil of lubricating viscosity;
- b) an alkaline earth metal sulfonate detergent providing 1200-2200 ppm of metal to the lubricating oil composition;
- c) a comb-shaped polymethacrylate viscosity modifier having a PSSI of less than 15;
- wherein the lubricating oil composition is an 0W-8, an 0W-12, an 0W-16, or an 0W-20 SAE viscosity grade;
- and
- wherein the lubricating oil composition is substantially free of a friction modifier.
A method for improving fuel economy in an internal combustion engine comprising lubricating said engine with a lubricating oil composition comprising:
- a) a major amount of oil of lubricating viscosity;
- b) an alkaline earth metal sulfonate detergent providing 1200-2200 ppm of metal to the lubricating oil composition;
- c) a comb-shaped polymethacrylate viscosity modifier having a PSSI of less than 15;
- wherein the lubricating oil composition is an 0W-8, an 0W-12, an 0W-16, or an 0W-20 SAE viscosity grade;
- and
- wherein the lubricating oil composition is substantially free of a friction modifier.
Dependencies are inferred from the claim text.