Novel VI improver, dispersant, and anti-oxidant additive and lubricating oil composition containing same

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount effective to impart viscosity index improvement, dispersancy, and anti-oxidant properties to said oil of an additive reaction product prepared by the steps comprising:

• (A) reacting a polymer prepared from ethylene and at least one C.sub.3 -C.sub.10 alpha-monoolefin and optionally a polyene selected from non-conjugated dienes and trienes comprising from about 15 to 80 mole percent ethylene, about 20 to 85 mole percent of said C.sub.3 -C.sub.20 alpha-monoolefin and from about 0 to 15 mole percent of said polyene, and having an average molecular weight ranging from about 5,000 to 500,000 with at least one olefinic carboxylic acid acylating agent to form one or more acylating reaction intermediates characterized by having a carboxylic acid acylating function within their structure, and
• (B) reacting said reaction intermediate in (A) with an amino-aromatic polyamine compound selected from the group consisting of:
• (a) an N-arylphenylenediamine represented by the formula:
• ##STR22## in which R.sup.1 is hydrogen, --NHaryl, --NH13 arylalkyl, a branched or straight chain radical having from 4 to 24 carbon atoms that can be alkyl, alkylene, alkoxyl, aralkyl alkaryl, hydroxylalkyl or aminoalkyl,
• R.sup.2 is --NH.sub.2, --CH.sub.2 13 (CH.sub.2).sub.n --NH.sub.2, --CH.sub.2 --aryl--NH.sub.2 in which n has a value from 1 to 10,
• and R.sub.3 is alkyl, alkenyl, alkoxyl, aralkyl, alkaryl radical of from 4 to 24 carbon atoms,
• b. an aminothiazole from the group consisting of aminothiazole, aminobenzothiazole, aminobenzothiadiazole and aminoalkylthiazole,
• c. an aminocarbazole represented by the formula:
• ##STR23## in which R and R.sup.1 represent hydrogen or an alkyl or alkoxyl, radical having from 1 to 14 carbon atoms,
• d. an aminoindole represented by the formula:
• ##STR24## in which R represents hydrogen or an alkyl radical having from 1 to 14 carbon atoms,
• e. an aminopyrrole represented by the formula:
• ##STR25## in which R is a divalent alkylene radical having 2-6 carbon atoms and R.sup.1 is hydrogen or an alkyl radical having from 1 to 14 carbon atoms,
• f. an amino-indazolinone represented by the formula:
• ##STR26## in which R is hydrogen or an alkyl radical having from 1 to 14 carbon atoms,
• g. an aminomercaptotriazole represented by the formula:
• ##STR27## h. and an aminoperimidine represented by the formula:
• ##STR28## in which R represents hydrogen or an alkyl, alkenyl, or alkoxyl radical having from 1 to 8 carbon atoms.