Exxon Research and Engineering Company

Norman Tunkel

Max J Wisotsky

Darrell W Brownawell

Alan A Schetelich

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.

Lubricating oil composition

Polymers of 1,000 to 50,000 and preferably of 1,000 to 2,900 number average molecular weight, comprising 3 to 40 molar proportions of ethylene per molar proportion of an ethylenically unsaturated monomer, are prepared by free radical catalysis in a solvent at temperatures of less than 130.degree. C. in order to minimize ethylene branching, for use as wax crystal modifying agents, e.g. pour depressants and flow improvers for distillate mineral oil, e.g. middle distillate fuel oil.

Copolymers of ethylene and ethylenically unsaturated monomers, process

Polymers of 1,000 to 50,000 and preferably of 1,000 to 2,900 number average molecular weight, comprising 3 to 40 molar proportions of ethylene per molar proportion of an ethylenically unsaturated monomer, are prepared by free radical catalysts in a solvent at temperatures of less than 130.degree.C. in order to minimize ethylene branching, for use as wax crystal modifying agents, e.g. pour depressants and flow improvers for distillate mineral oil, e.g. middle distillate fuel oil.

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Perth Amboy, NJ, United States of America

Norman Tunkel