Exxonmobil Research and Engineering Company

William H Buck

Douglas Edward Deckman

William L Maxwell

Jacob Joseph Habeeb

David Joseph Baillargeon

L Oscar Farng

Mark D Winemiller

Andrew G Horodysky

Liehpao O Farng

Thomas J Karol

Andrew Jackson

Eugine Choi

Willie Allan Givens, Jr

Steven Kennedy

Marcia G Rogers

Andrew G Horodsky

Liehpao Oscar Farng

Liegpao O Farng

Willie A Givens

Jr Willie A Givens

The present invention is directed to a method for improving one or more of the control of deposit formation and friction in an engine lubricated using a lubricating oil comprising a base oil and additives by employing as the additive the necessary combination of a borated hydroxyl saturated hydrocarbyl ester amide-amine mixture, zinc dialkyl dithiophosphate, and metal salicylate detergent, the deposit formation and friction being improved as compared to a lubricating oil containing the borated hydroxyl saturated hydrocarbyl ester amide-amine mixture, zinc dialkyl dithiophosphate and a detergent other than metal salicylate, such as metal phosphate and/or metal sulfonate.

Method for reducing one or more of deposits and friction of a lubricating oil

Disclosed are sulfur and phosphorous free, borated organomolybdenum compositions containing borated alcohols. These compositions can be formulated with ashless antioxidants and low levels of phosphorous containing antiwear compounds to provide improved lubricating compositions.

Organomolybdenum-boron additives

Lubricating oil compositions of the invention comprise a major amount of a base oil of lubricating viscosity and an effective amount of at least one lubricant antioxidant, the base oil comprising a blend of a Group III base oil derived from a synthesis gas, and a Group IV base oil wherein the ratio of the Group III to Group IV base oils is such that the lubricating composition exhibits an oxidation stability determined by a measure of high temperature deposits that is less than half the mathematical sum of the oxidative stability determined for each of the unblended Group III and Group IV oils containing the same antioxidant in the same amount as in the blend.

Synthetic lubricating compositions

The present invention is directed to ashless detergents comprising the products resulting from the reaction of a salicylic acid, organic group substituted salicylic acid, sulfonic acid or organic groups substituted sulfur acid with thiadiazole or organic group substituted thiadiazole or an alkyl primary or secondary amine, and to formulated lubricating oils containing said ashless detergents.

Ashless detergents and formulated lubricating oil containing same

The present invention concerns a detergent additive for lubricating oil compositions comprising at least two of low, medium, and high TBN detergents. Preferably the detergent is a calcium salicylate. The present invention also concerns lubricating oil compositions comprising such detergents, and at least one of Group II base stock, Group III base stock, or wax isomerate base stock.

Mixed TBN detergents and lubricating oil compositions containing such detergents

The present invention provides a viscosity index improving lubricant additive which comprises an olefinic oligomer of about 2,000 to about 20,000 number average molecular weight having a viscosity of 75 to about 3,000 cSt at 100&#xb0; C. and a hydrocarbyl aromatic which contains at least about 5% of its weight from aromatic moieties having a viscosity of about 3 to about 50 cSt at 100&#xb0; C. where the weight ratio of hydrocarbyl aromatic component to olefin oligomer is from about 1:2 to about 50:1. In another aspect, the invention provides for a lubricating oil composition comprising a base oil and the instant viscosity index improving additive.

Lubricating oil compositions

A lubricating composition for internal combustion engines especially useful with fuels having less than 350 ppm sulfur comprises a lubricating oil basestock, a boron containing ashless dispersant, a molybdenum containing friction reducing agent, a metal type detergent and zinc dithiophosphate.

Low ash, low phosphorus and low sulfur engine oils for internal combustion engines

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West Chester, PA, United States of America

William H Buck