Egr equipped diesel engines and lubricating oil compositions

Details Egr equipped diesel engines and lubricating oil compositions Egr equipped diesel engines and lubricating oil compositions

C - Chemistry, Metallurgy

10

M

C10M 143/12 (2006.01) C10M 143/10 (2006.01) C10M 159/22 (2006.01) F01M 11/00 (2006.01) F02B 47/08 (2006.01) F02B 75/12 (2006.01)

Patent

CA 2436353

Soot induced kinematic viscosity increase of lubricating oil compositions for heavy duty diesel engines equipped with EGR systems operating in a condensing mode can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and dispersants. The engine is lubricated with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more high molecular weight polymers comprising (i) copolymers of hydrogenated poly(monovinyl aromatic hydrocarbon) and poly (conjugated diene), wherein the hydrogenated poly(monovinyl aromatic hydrocarbon) segment comprises at least about 20 wt.% of the copolymer; (ii) olefin copolymers containing alkyl or aryl amine, or amide groups, nitrogen-containing heterocyclic groups or ester linkages or (iii) acrylate or alkylacrylate copolymer derivatives having dispersing groups.

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