Lubricating oil composition with viscosity modifier with low shear stability index
AssigneeChevron Oronite Company LLC
InventorsMaryam SEPEHR, David L. MORGAN, Claire CHOMMELOUX, Peter KLEIJWEGT, Sara Yue ZHANG
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Abstract
This disclosure describes a method of improving fuel economy of an engine. The method involves lubricating the engine with a lubricating oil composition that includes a) an oil of lubricating viscosity; and b) a viscosity modifier including an olefin copolymer or diene-based copolymer or homopolymer wherein the viscosity modifier has shear stability index of 15 or less. The lubricating oil composition is substantially free of viscosity modifiers other than the viscosity modifier of b).
Claims20
A method of improving fuel economy of an engine, the method comprising:
- lubricating the engine with a lubricating oil composition comprising:
- a) an oil of lubricating viscosity;
- and
- b) a viscosity modifier comprising an olefin copolymer or diene-based copolymer or homopolymer wherein the viscosity modifier has shear stability index of 15 or less;
- wherein the lubricating oil composition is substantially free of viscosity modifiers other than the viscosity modifier of b).
A method of increasing the fuel economy of a diesel engine, the method comprising:
- lubricating the diesel engine with a lubricating oil composition comprising:
- a) an oil of lubricating viscosity;
- and
- b) a viscosity modifier comprising an olefin copolymer or diene-based copolymer or homopolymer, wherein the viscosity modifier has shear stability index of 15 or less;
- wherein the lubricating oil composition is substantially free of viscosity modifiers other than the viscosity modifier of b).
Dependencies are inferred from the claim text.