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Abstract

The present invention is directed to a lubricating oil composition, a diesel engine comprising a lubricating oil composition, and a method of lubricating a diesel engine provided with an exhaust gas recirculation system, comprising lubricating said engine with a lubricating oil composition comprising an oil of lubricating viscosity, and a polymeric N-dispersant booster comprising monomer units of: a) 0 to 40 wt. % of one or more ethylenically unsaturated ester compounds of formula (I) ##STR00001## wherein R is equal to H or CH.sub.3, R.sup.1 represents a linear or branched alkyl group with 1 to 5 carbon atoms, R.sup.2 and R.sup.3 independently represent H or a group of the formula --COOR', wherein R' is H or an alkyl group with 1 to 5 carbon atoms, b) 10 to 98 wt. % of one or more ethylenically unsaturated ester compounds of formula (II) ##STR00002## wherein R is equal to H or CH.sub.3, R.sup.4 represents a linear or branched alkyl group with 6 to 15 carbon atoms, R.sup.5 and R.sup.6 independently represent H or a group of the formula --COOR'', wherein R'' is H or an alkyl group with 6 to 15 carbon atoms, c) 0 to 30 wt. % of one or more ethylenically unsaturated ester compounds of formula (III) ##STR00003## wherein R is equal to H or CH.sub.3, R.sup.7 represents a linear or branched alkyl group with 16 to 30 carbon atoms, R.sup.8 and R.sup.9 independently represent H or a group of the formula --COOR''', wherein R''' is H or an alkyl group with 16 to 30 carbon atoms, d) 0 to 30 wt. % vinyl monomers, e) 7 to 25 wt. % of at least one N-- dispersant monomer, wherein a)-e) add up to 100 wt. %.

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First Claim