Polyisobutylene succinimide, ethylene-propylene succinimide and an alkylated phenothiazine additive for lubricating oil compositions
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United States of America Patent
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Mar 25, 1997
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N/A
app pub date -
Jun 7, 1995
filing date -
Dec 1, 1993
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Abstract
A lubricating oil composition comprising: (a) a major amount of an oil of lubricating viscosity; and (b) a minor amount of a synergistic combination of an antioxidant-dispersant additive and a dispersant additive, said combination comprising: (i) a polyisobutylene succinimide; (ii) an ethylene-propylene succinimide; and (iii) an akylated phenothiazine represented by the formula ##STR1## wherein R.sup.1 is a linear or branched (C.sub.4 -C.sub.24) alkyl, heteronlykl or alkylary group; and R.sup.2 is H or a linear or branched (C.sub.4 -C.sub.24) alkyl group.
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