Lubricating oil composition

A lubricating oil composition comprising a major proportion of a base oil of lubricating viscosity and a minor dispersant amount of a reaction product prepared by the process which comprises reacting an alkenyl succinic acid or anhydride having the structural unit represented by the formula:

• ##STR2## in which R is an alkenyl radical having a molecular weight ranging from about 250 to 3000 with an amine represented by the formula:
• R'R"N -- X -- Y
• in which R' and R" represent hydrogen or a monovalent alkyl, aminoalkyl or hydroxyalkyl radical having from 1 to 8 carbon atoms, X is a divalent hydrocarbon radical having from 2 to 8 carbon atoms and Y is radical selected from the group consisting of hydrogen, amino, hydroxyl and a radical having the formula O(R'"O).sub.x H in which R'" is an alkylene radical having from 2 to 3 carbon atoms and x is an integer from 1 to 5, in the presence of a free radical initiator, the molar proportion of said amine to said succinic acid or anhydride being greater than one.