LUBRICANT COMPOSITION FOR COMBUSTION ENGINE CONTAINING DISPERSANT ADDITIVE AND POLYMER DISPERSANT VISCOSITY INDEX IMPROVER
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United States of America Patent
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Issued Date -
Jul 1, 2010
app pub date -
May 1, 2008
filing date -
May 10, 2007
priority date (Note) -
Abandoned
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Abstract
A multigrade lubricating oil composition with enhanced anti-wear properties for use in an internal combustion engine comprises (a) a base oil comprising at least 90% by weight of the base oil, of one or more basestocks selected from the group consisting of base stocks derived from Fischer-Tropsch synthesised, waxy, paraffinic hydrocarbon material by processes comprising hydrocracking and/or hydroisomerisation, Group II basestocks, Group III basestocks and mixtures thereof; (b) one or more dispersant viscosity modifiers in a total amount of 0.15 to 0.8% by weight of the composition; (c) one or more dispersants in a total amount of active dispersants of 1.5 to 3% by weight of the composition; (d) one or more detergents; and (e) one or more metal dihydrocarbyl dithiophosphates.
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