Exxon Chemical Patents, Inc.

Exxon Research and Engineering Company

Alan A Schetelich

Glen P Fetterman

Robert D Lundberg

Antonio Gutierrez

Darrell W Brownawell

Robert R Phillips

Norman Tunkel

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)

This invention relates to oil soluble additives particularly useful in lubricating oil compositions, and to concentrates or lubricating compositions containing these additives. The additives are various metal salts of mono- or dicarboxylic acids, anhydrides, esters, etc., which have been substituted with a high molecular weight hydrocarbon group, and derivatives thereof. The high molecular weight hydrocarbon group has a number average-molecular weight (M.sub.n) of greater than about 900. The metal salt additives are especially useful in combination with certain grafted ethylene-olefin copolymers or copolymers of 4-vinyl pyridine and esters of aliphatic mono-, di- or polycarboxylic acids as viscosifying agents.

Hydrocarbon soluble complexes based on metal salts of polyolefinic

There is disclosed an improved lubricating oil composition useful in both gasoline and diesel engines which contains polyisobutenyl succinic anhydride as a supplemental dispersant-detergent in combination with a conventional lubricating oil dispersant.

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Scotch Plains, NJ, United States of America

Alan A Schetelich