PASSENGER CAR MOTOR OIL FORMULATIONS WITH GROUP I, GROUP II AND GROUP III BASESTOCKS
Publication Date: 2002-Dec-13
The IP.com Prior Art Database
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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.