Exxon Chemical Patents, Inc.

Exxon Research and Engineering Company

Infineum USA LP

Edward Francis Outten

Andrew James Ritchie

Jack Ryer

Ricardo A Bloch

Malcolm Waddoups

Arunas T Lapinas

John E Williams

Andrew James Dalziel Ritchie

Thus, the instant invention is directed toward an oil for diesel engines comprising an admixture of (A) a major amount of an oil of lubricating viscosity, (B) at least 4 mass % dispersant, (C) at least 0.3 mass % of a metal phenate, (D) less than 0.1 mass % friction modifier, (E) less than 0.3 mass % ofashlesssulfurized phenols and, (F) less than 0.12 mass % neutral calcium sulfonate.

Crankcase lubricant for heavy duty diesel oil

A lubricating oil having an ashless nitrogenous TBN source together with ash containing detergent having a TBN in excess of 100, a source of magnesium, and metal dihydrocarbyl dithiophosphate with predominantly or exclusively secondary hydrocarbyl groups is described. It comprises a major amount of an oil of lubricating viscosity having a sulfated ash content between 0.35 and 2 mass percent and A) a nitrogenous TBN source selected from the group consisting of ashless nitrogen containing dispersants, ashless nitrogen containing dispersant viscosity modifiers, oil soluble aliphatic, oxyalkyl, or arylalkyl amines and mixtures thereof; B) a metal salt of an oil soluble acid having a TBN in excess of 100; C) at least 500 ppm (mass) magnesium; and D) at least one metal dihydrocarbyl dithiophosphate. The nitrogenous TBN source provides at least about 1.5 TBN to the finished lubricant. The metal salt of an oil soluble acid provides at least about 40% of the total TBN of the composition. At least 50 mole per cent of the hydrocarbyl groups on the dithiophosphate are secondary. Overbased magnesium sulfonate may be used as the metal salt of an oil soluble sulfonic acid having a TBN in excess of 100 and the additive providing at least 500 ppm (mass) magnesium. The lubricant may be free of aromatic amines having at least two aromatic groups attached directly to the nitrogen. It may have at least 100 ppm (mass) boron and at least 1000 ppm (mass) phosphorous. The boron-to-nitrogen ratio is at least 0.1.

Crankcase lubricant for modern heavy duty diesel and gasoline fueled

Thus, the instant invention is directed toward an oil for diesel engines comprising an admixture of (A) a major amount of an oil of lubricating viscosity, (B) at least 4 mass % dispersant, (C) at least 0.3 mass % of a metal phenate, (D) less than 0.1 mass % friction modifier, (E) less than 0.3 mass % of sulfurized phenols and, (F) less than 0.12 mass % neutral calcium sulfonate.

A fluid having a mineral lubricating oil base and containing the combination of an oil-soluble tris (C.sub.8 -C.sub.24 hydrocarbyl) phosphite ester and an oil-soluble C.sub.8 -C.sub.24 hydrocarbyl substituted phenol, the weight ratio of said phosphite to said phenol ranging from about 4:1 to 1:4, preferably 3:1 to 1:3 whereby elastomer compatibility of said fluid is enhanced. The phosphite ester-substituted phenol combination imparts to the fluid the property of maintaining the chemical and physical properties of seals under oxidizing condition in automatic transmissions, power transmissions and power steering systems and thereby improves retention of the fluid in these mechanical structures; preferably when at least an inhibitory amount of an anti-oxidant capable of trapping free radicals at temperatures above 65.degree. C., preferably 80 .degree. to 200.degree. C. is present.

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East Brunswick, NJ, United States of America

Edward Francis Outten