Exxonmobil Research and Engineering Company

Brandon T Weldon

Jacob Joseph Habeeb

Ramesh Varadaraj

Douglas Edward Deckman

Michael Eugene Landis

Steven Kennedy

Abhimanyu Onkar Patil

Steven Paul Rucker

Jason Zhisheng Gao

William L Maxwell

Riccardo Conti

Nicole D Vaughn

Heather M Haigh

Steven M Jetter

Jeffrey Robert Torkelson

William J Golumbfskie

The lubricating oil used to lubricate diesel engines is stabilized against the detrimental degradation effects of biodiesel fuel by the addition to the lubricating oil of an additive concentrate comprising a premix of a first antioxidant, a second antioxidant of a type different from the first and an organometallic compound.

Method for stabilizing diesel engine lubricating oil against degradation by biodiesel fuel

The present invention is directed to a method for controlling soot induced viscosity increase in diesel engines, by using as the diesel engine lubricant an oil formulation comprising a base oil containing about 10 to 80 wt % GTL base stock and/or base oil and/or hydrodewaxed or hydroisomerized/catalytic (or solvent) dewaxed base stock and/or base oil in combination with 20 to 90 wt % conventional Group I petroleum derived base oil, said base oil being further combined with a polymeric viscosity modifier, and to the lubricating oil which effects such control over soot induced viscosity increase.

Soot control for diesel engine lubricants

Lubricating oil used for the lubrication of engines run on biodiesel fuels are improved in their resistance to oxidation, sludge and deposits formation by the addition to said lubricating oil of detergent to increase the TBN of the lubricating oil or the addition of organic bases.

Method for improving the resistance to one or more of corrosion, oxidation, sludge and deposit formation of lubricating oil compositions for biodiesel fueled engines

The resistance to deposit formation in formulated lubricating oils is enhanced by the addition to the lubricating oil of an additive amount of ionic liquids.

Method for the control of deposit formation in formulated lubricating oil by use of ionic liquids as additives

The present invention is directed to method of making a green lubricant composition having improved wear protection and reduced phosphorus emissions.

Green lubricant compositions

The present invention is directed to green lubricant compositions comprising a base oil and an effective amount of premixed additives that improve wear protection and reduce phosphorus emissions.

The present invention is directed to lubricating oils exhibiting improved resistance to oxidation and deposit/sludge formation comprising a lubricant base oil and catalytic antioxidants comprising an effective amount of a) one or more polymetal organometallic compound; and, b) effective amounts of one or more substituted N,N'-diaryl-o-phenylenediamine compounds or c) one or more hindered phenol compounds or both, to a method for improving the antioxidancy and the resistance to deposit/sludge formation of formulated lubricating oil compositions by the addition thereto of an effective amount of the aforementioned catalytic antioxidants, and to an additive concentrate containing the aforementioned catalytic antioxidants.

Catalytic antioxidants

Periodically heating a soot containing engine lubricant to a temperature in the range of about 115&#xb0; C. to about 150&#xb0; C. is effective in controlling soot induced viscosity increase of the lubricant. The period at which heating is conducted may be a function of the number of hours the engine has been operated or it may be based on the oil condition.

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Pearland, TX, United States of America

Brandon T Weldon