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PASSENGER CAR MOTOR OIL FORMULATIONS WITH GROUP I, GROUP II AND GROUP III BASESTOCKS

IP.com Disclosure Number: IPCOM000010546D
Publication Date: 2002-Dec-13
Document File: 11 page(s) / 88K

Publishing Venue

The IP.com Prior Art Database

Related People

Roby, S.H.: INVENTOR [+2]

Related Documents

IPCOM000010189D: IP.COM [+3]

Abstract

The API SL/ILSAC GF-3 passenger car engine oil category places a premium on oxidative oil thickening. In particular, the Sequence IIIF engine dynamometer test is specifically designed to severely stress engine oils under high-speed, high-load conditions for 80 hours of continuous operation. High temperature piston deposit severity has also increased. Oxidation and deposit control have proven to be significant challenges. Traditional oxidation inhibitors or inhibitor combinations are often ineffective in the Sequence IIIF. Our work has shown that sulfurized olefin oxidation inhibitors effectively control Sequence IIIF oxidative thickening, particularly when used in combination with a post-treated dispersant.

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Passenger Car Motor oil formulations with group i, group II and group III basestocks

Abstract of the Disclosure

The API SL/ILSAC GF-3 passenger car engine oil category places a premium on oxidative oil thickening.� In particular, the Sequence IIIF engine dynamometer test is specifically designed to severely stress engine oils under high-speed, high-load conditions for 80 hours of continuous operation.� High temperature piston deposit severity has also increased.

Oxidation and deposit control have proven to be significant challenges.� Traditional oxidation inhibitors or inhibitor combinations are often ineffective in the Sequence IIIF.� Our work has shown that sulfurized olefin oxidation inhibitors effectively control Sequence IIIF oxidative thickening, particularly when used in combination with a post-treated dispersant.

Summary of the Invention

The present invention is related to a lubricating oil composition for internal combustion engines.� More particularly, the lubricating oil composition of the present invention is directed to a combination of a sulfurized ester olefin and a borated dispersant that effectively controls Sequence IIIF oxidative thickening.

In its broadest embodiment, the lubricating oil composition of the present invention comprises:

a)                 major amount of a base oil of lubricating viscosity; and

b)                 a minor, but effective, amount of a mixed dispersant system comprising an ethylene-carbonated post-treated and borated post-treated dispersant system, and

c)                  optionally, a sulfurized ester olefin to control Sequence IIIF oxidative thickening.

Among other factors, it will be understood that this invention is not based on the discovery of any one of the disclosed components as new compositions of matter or their individual usefulness as additive agents in lubricant oil compositions.� Rather the lubricating oil composition of the present invention is based on the surprising discovery that a lubricating oil composition comprising the above aforementioned embodiment is useful for the severe service function required by the API SL/ILSAC GF-3 passenger car engine oil category and improves Sequence IIIF oxidative thickening.� The present lubricating oil composition exhibit a significant reduction in oxidative thickening and accordingly are useful for reducing oxidative thickening when employed in a lubricating oil.� Therefore, another aspect of the present invention is directed to a method for improving the oxidative thickening in an internal combustion engine by operating such an engine with the lubricating oil composition of the present invention.

detailed description of the invention

The Sequence III test has been completely redesigned for API SL/ILSAC GF-3 as the Sequence IIIF.� The new API SL/ILSAC GF-3 passenger car engine oil category places a premium on oxidative oil thickening.� In particular, the Sequence IIIF engine dynamometer test is specifically designed to severely stress engine oils under high-speed, high-load conditions f...