The Lubrizol Corporation

Chevron U.s.a. Inc.

Sona Sivakova

William R S Barton

John A Zakarian

David M Nickerson

Kamalakumari Kunchithapatham Salem

Thomas S Corrigan

Hyun-Soo Hong

Paul Simon O'Hora

Tomoya Higuchi

Farrukh Qureshi

Christopher Engel

Patricia Standen

William RS Barton

John Aleksonis Zakarian

Described herein is a process, comprising: a) selecting an API Group II base stock with selected viscosity index and pour point; b) blending a base oil with the base stock, and c) adding to the base oil: i) a liquid ethylene propylene copolymer viscosity modifier that reduces a traction coefficient, and ii) an additive package, to make a driveline fluid that has a defined viscosity index and excellent shear stability. Also provided is a driveline fluid composition having the high viscosity index and excellent shear stability, comprising: a) a base oil comprising from 50 wt % to 100 wt % API Group II base stock; b) a liquid ethylene propylene copolymer viscosity modifier that reduces a traction coefficient; and c) an additive package. Further provided is a method for lubricating an axle or manual transmission by supplying the driveline fluid composition.

Driveline fluids comprising API group II base oil

A lubricant composition of an oil of lubricating viscosity, a grafted copolymer viscosity modifier that is an ashless condensation reaction product of an olefin polymer, having a number average molecular weight of about 1000 to about 10,000, comprising carboxylic acid or equivalent functionality grafted onto the polymer backbone, with a monoamine or a polyamine often having a single primary amino group, which exhibits good dispersancy and viscometric performance in a driveline device.

Nitrogen-functionalized olefin polymers for driveline lubricants

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Wickliffe, OH, United States of America

Sona Sivakova