Lubricating oil compositions and methods for improving fuel economy in an internal combustion engine using same
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United States of America Patent
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Issued Date -
Sep 30, 2004
app pub date -
Mar 28, 2003
filing date -
Mar 28, 2003
priority date (Note) -
Abandoned
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Abstract
A lubricating oil composition is provided which comprises (a) an oil of lubricating viscosity having a kinematic viscosity of about 2 to 10.5 cSt at 100.degree. C. and (b) a friction modifying effective amount of an ashless friction modifier comprising a reaction product of a C.sub.4 to about C.sub.75 fatty acid ester and an alkanolamine. Particularly preferred is a lubricating oil composition comprising (a) an oil of lubricating viscosity having a kinematic viscosity of about 2 to 10.5 cSt at 100.degree. C. and comprising about 55 to about 85 weight percent of a first lubricating oil, and about 15 to about 45 weight percent of a second lubricating oil wherein the kinematic viscosity of the second lubricating oil is lower than the kinematic viscosity of the first lubricating oil at 100.degree. C.; and (b) about 0.5 to about 5.0 weight percent, based on the total weight of the lubricating oil composition, of an ashless friction modifier comprising a reaction product of a C.sub.4 to about C.sub.75 fatty acid ester and an alkanolamine.
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