Exxon Chemical Patents, Inc.

Exxon Chemical Limited

Paul Brice

David Y Chung

Mark J Struglinski

John B Gardiner

David Robert Adams

Steven James Searis

This invention relates to shear stable multigrade oils for crankcase lubrication of gasoline and diesel engines which oils are substantially free of viscosity modifier additives and comprise a detergent inhibitor package of lubricating oil additives, which package includes an ashless dispersant comprising an oil soluble polymeric hydrocarbon backbone having functional groups in which the hydrocarbon backbone is derived from an ethylene alpha-olefin (EAO) copolymer or alpha-olefin homo- or copolymer an M.sub.n of from 500 to 7000. Such multigrade crankcase oils without viscosity modifiers are more economical and may provide better diesel performance and seal comparability. The oils are also substantially shear stable and may be used in turbocharged engines and racing engines, with reduced mechanical breakdown of the oil.

Multigrade lubricating compositions containing no viscosity modifier

This invention relates to low volatility 5W20, 5W30, 10W40, 10W50, 15W40 or 15W50 multigrade oils for crankcase lubrication of gasoline and diesel engines, the oils comprising:

Low volatility lubricating compositions

The present invention relates to novel multifunctional viscosity modifiers comprising a mixture of derivatized ethylene-alpha olefin copolymers, A and B. Said A copolymer comprising from about 30 to about 60 weight percent monomer units derived from ethylene and said B copolymer comprising from about 60 to about 80 weight percent units derived from ethylene.

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Abingdon, United Kingdom

Paul Brice