Fuel compositions having polyalkylene succinimides and preparation thereof

A fuel oil composition comprising a major amount of oil hydrocarbon boiling on the gasoline or diesel fuel range an amount of a succinimide composition which is effective to reduce injection or chamber deposits, wherein said succinimide composition is prepared by reacting a mixture under reactive conditions at temperatures in the range of about from 140.degree. to 180.degree. C. for about from 1 to 10 hours, wherein the mixture comprises:

• (a) an alkenyl or alkylsuccinic acid derivative, wherein the alkenyl or alkyl substituent has a Mn of from 1000 to 5000;
• (b) an unsaturated acidic reagent copolymer of
• (1) an unsaturated acidic reagent and
• (2) an alkylene group selected from the group consisting of an .alpha.-olefin having 8 to 42 carbon atoms, a polyalkylene having from 8 to 28 carbon atoms, ethylene, styrene, 1,3-butadiene, vinyl alkyl ether having at least 3 carbon atoms, and vinyl alkanoate having at least 4 carbon atoms;
• and
• (c) a polyamine having at least three nitrogen atoms and 4 to 20 carbon atoms;
• and
• wherein said mixture contains from 0.5 to 10 equivalents of said alkenyl or alkylsuccinic acid derivative per equivalent of said unsaturated acidic reagent copolymer and from 0.4 to 1.0 equivalents of said polyamine per equivalent of alkenyl or alkylsuccinic acid derivative plus unsaturated acidic reagent copolymer.