Afton Chemical Corporation

Todd M Dvorak

Mark Thomas Devlin

Kenneth J Garelick

Robert T Dittmeier

Dewey P Szemenyei

John T Loper

Roger M Sheets

A lubricating oil composition comprising greater than 50 wt. % of a base oil of lubricating viscosity, and an additive composition comprising: an amount of one or more zinc dialkyl dithiophosphates (ZDDP compounds) and an amount of one or more viscosity modifiers, wherein an amount of phosphorus (P) in weight percent provided to the lubricating oil composition by the one or more ZDDP compounds divided by the amount of the one or more viscosity modifiers (VM) in weight percent based on a total weight of the lubricating oil composition is a P/VM quotient of more than about 0.0075. The lubricating oil composition can improve resistance to engine deposits and extend oil drain intervals of an internal combustion engine.

Lubricating oil compositions with resistance to engine deposit and varnish formation

A lubricating oil composition comprising greater than 50 wt. % of a base oil of lubricating viscosity, and either: a) an additive composition comprising: one or more zinc dialkyl dithiophosphates (ZDDP compounds) and one or more dispersants, wherein the amount of zinc (Zn) in weight percent provided to the lubricating oil composition by the one or more ZDDP compounds multiplied by the contribution of the total base number (TBN) of the one or more dispersants to the TBN of the lubricating oil composition is a multiplication factor Zn*TBNDisp of at least about 0.06; or b) an additive composition comprising: one or more zinc dialkyl dithiophosphates (ZDDP compounds) and one or more dispersants, wherein the amount of phosphorus (P) in weight percent provided to the lubricating oil composition by the one or more ZDDP compounds multiplied by the contribution of the total base number (TBN) of the one or more dispersants to the TBN of the lubricating oil composition is a multiplication factor P*TBNDisp of at least about 0.051.

Lubricating oil composition having resistance to engine deposits

A lubricating oil composition comprising greater than 50 wt. % of a base oil of lubricating viscosity; an amount of one or more ester(s) of a polyhydric alcohol; an amount of one or more boron-containing dispersant(s); wherein a ratio of the amount of the one or more ester(s) of a polyhydric alcohol in weight percent provided to the lubricating oil composition, to an amount of boron in weight percent provided by the one or more boron-containing dispersant(s), based on the total weight of the lubricating oil composition is less than 40. The lubricating oil composition has improved corrosion performance in an engine or other mechanical components lubricated with the lubricating oil.

Engine oil formulation with improved sequence VIII performance

The present disclosure relates to methods of improving viscosity shear stability of a lubricating oil and lubricating oil composition comprising:

Engine oil formulation with improved Sequence VIII performance

A system, a method and a computer program to determine the usability of a lubricant such as, e.g., engine oil, and when to replace the lubricant in a particular engine. The system, method, and computer program are further configured to generate a lubricant discard interval for each engine in, e.g., a company's fleet of vehicles. The system, method, and computer program are configured to generate lubricant discard interval schedule for each of the vehicles in the company's fleet based on the lubricant discard intervals.

System and method for determining a lubricant discard interval

A system, a method and a computer program to predict a portion of used lubricant in an engine that is to be drained and replaced by fresh lubricant based on an analysis parameter value that is measured in a sample of used engine lubricant from the engine. The system includes a first input that receives the analysis parameter value from the used lubricant and stores the analysis parameter value in a memory of a processor. A second input receives an analysis parameter threshold value for the used lubricant at the end of a service interval and stores the analysis parameter threshold value in a memory of the processor. A determiner predicts a future analysis parameter value of the used lubricant at the end of the service interval based on the analysis parameter value, and the analysis parameter threshold value.

System and method for extending a lubricant discard interval

There is disclosed a lubricant composition comprising a base oil comprising a reduced total amount of cyclobenzene as compared to another base oil. Methods of using the lubricant composition for preventing and/or reducing the deposit formation in an engine are also disclosed.

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Glen Allen, VA, United States of America

Todd M Dvorak