Exxon Chemical Patents, Inc.

Infineum International Limited

Glen P Fetterman

Christopher Brian Locke

Alan A Schetelich

Antonio Gutierrez

Jacob I Emert

Matthew David Irving

Christopher J Locke

Andrew J D Ritchie

Jai G Bansal

Michael T Minotti

Andrew Jd Ritchie

Michael Minotti

Andrew JD Ritchie

Soot induced kinematic viscosity increase of lubricating oil compositions for diesel engines equipped with EGR systems can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and/or dispersants.

Lubricating oil compositions

Soot induced kinematic viscosity increase of lubricating oil compositions for heavy duty diesel engines equipped with EGR systems operating in a condensing mode can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and dispersants.

EGR equipped diesel engines and lubricating oil compositions

In accordance with the present invention, there are provided low sulfated ash lubricating oil compositions which comprise an oil of lubricating viscosity as the major component and as the minor component (A) at least about 2 wt % of at least one ashless nitrogen- or ester-containing dispersant, (B) an antioxidant effective amount of at least one oil soluble antioxidant material, and (C) at least one oil soluble dihydrocarbyl dithiophosphate antiwear material wherein the hydrocarbyl groups contain an average of at least 3 carbon atoms, and wherein the lubricating oil is characterized by a total sulfated ash (SASH) level of from 0.01 to about 0.6 wt % and by a SASH wt:dispersant wt ratio of from about 0.01 to about 0.2:1.

Low ash lubricant compositions for internal combustion engines

In accordance with the present invention, there are provided low sulfated ash lubricating oil compositions which copmrise an oil of lubricating viscosity as the major component and as the minor component (A) at least about 3 wt % of at least one ashless nitrogen- or ester-containing dispersant, (B) at least about 2 wt % of at least one sulfurized alkyl phenol, and (C) at least one metal dihydrocarbyl dithiophosphate wherein the hydrocarbyl groups contain an average of at least 6 carbon atoms, and wherein the lubricating oil is characterized by a total sulfated ash (SASH) level of from 0.01 to about 0.6 wt % and by a SASH:dispersant wt:wt ratio of from about 0.01 to about 0.2:1.

Lubricant compositions for internal combustion engines

In accordance with the present invention, there are provided low sulfacted ash lubricating oil compositions which comprise an oil of lubricating viscosity as the major component and as the minor component (A) at least about 2 wt % of at least one ashless nitrogen- or ester-containing dispersant, (B) an antioxidant effective amount of at least one oil soluble antioxidant material, and (C) at least one oil soluble dihydrocarbyl dithiophosphate antiwear material wherein the hydrocarbyl groups contain an average of at least 3 carbon atoms, and wherein the lubricating oil is characterized by a total sulfated ash (SASH) level of from 0.01 to about 0.6 wt % and by a SASH wt:dispersant wt ratio of from about 0.01 to about 0.2:1.

Low ash lubricant compositions for internal combustion engines (PT-727)

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Morris Plains, NJ, United States of America

Glen P Fetterman