Abstract: An additive composition comprising a graft and aminoheteroaromatic derivatized copolymer prepared from ethylene and at least one C.sub.3 -C.sub.10 alpha-monoolefin and, optionally, a comprising from about 15 to 80 mole percent of ethylene, from about 20 to 85 mole percent of said C.sub.3 -C.sub.10 alpha-monoolefin and from about 0 to 15 mole percent of said polyene having a number average molecular weight ranging from about 5000 to 500,000 which has been reacted 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 reacting said reaction intermediate with an aminoheteroaromatic compound and a lubricating oil composition containing same are provided.

Abstract: An additive composition comprising a graft and derivatized block copolymer prepared from a styrene-ethylenebutylene-styrene characterized in that unsaturation in the styrene blocks is equal to or greater than 50 percent, and the ethylenebutylene block is hydrogenated leaving no more than 10 percent unsaturation which has been grafted with at least one olefinic carboxylic acid acylating agent and then derivatized with an aminoaromatic compound from the group consisting of aminopyridines, aminopyrazines and aminopyrimidines, and a lubricating oil composition containing same are provided.