A composition of matter suitable for use as a dispersant-viscosity improver for lubricating oil compositions comprises the reaction product of reactants comprising (a) hydrocarbon polymer grafted with an &agr;,&bgr;-ethylenically unsaturated carboxylic acid or functional derivative thereof; and (b) an amine selected from the group consisting of (b-1) a product made by contacting at least one hydroxy-containing material with at least one amine having at least one N—H group, and (b-2) an acylated derivative of (b-1) containing at least one condensable N—H group.