Lubricant compositions containing dispersant additives

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of a compound of the formula:

• ##STR5## wherein two R.sup.3 groups attached to the same nitrogen atom and taken together with said nitrogen atom may form a 5 or 6 membered saturated or unsaturated nitrogen heterocyclic radical;
• wherein said heterocyclic radical may be substituted with substituents selected from:
• (A) hydrogen, (B) hydrocarbyl groups of from 1 to 10 carbon atoms;
• (C) acyl groups of from 2 to 10 carbon atoms;
• and (D) monoketo, monohydroxy, mononitro, monocyano, lower alkyl and lower alkoxy derivatives of the substituents of (B) and (C);
• wherein the remaining R.sup.3 groups are the same or different substituents selected from (A), (B), (C), (D) and poly(oxyalkylene) oxycarbonyl groups of the formula R--OC.sub.g H.sub.2g).sub.m O--C(O)-- in which g is an integer from 2 to 5;
• j is an integer such that the molecular weight of the poly(oxyalkylene) group is about 500 to 5,000, and R is a hydrocarbyl group of from 1 to 30 carbon atoms, wherein the R.sup.1 are the same or different alkylene, carbonyl, oxycarbonyl, or hydroxy-substituted alkylene radical of from 2 to 6 carbon atoms, and R.sup.2 is carbonyl, alkylene carbonyl or alkylene of 2 to 4 carbon atoms with vicinal linkages;
• wherein at least one of the R.sup.3 groups is said poly(oxyalkylene) oxycarbonyl group in which a sufficient number of oxyalkylene units, --OC.sub.g H.sub.2g --, are branched chains C.sub.3 -C.sub.5 oxyalkylene units to render said compound soluble in said lubricating oil composition;
• wherein R.sup.3, R.sup.1, and R.sup.2 are selected such that at least one nitrogen atom is a basic nitrogen atom;
• and wherein a is 0 or 1, b is an integer 0 to 4, c is 0 or 1, d is 0 or 1, e is 0 or 1, f is 0 or 1 and equal to 1 when c is 0, and the sum f+b+2c+e is equal to or greater than 2.