Lubricating oil dispersant and viton seal additives

A lubricating oil composition comprising a major portion of a lubricating oil and minor dispersant amount of a reaction product prepared by the process which comprises:

• (a) reacting an alkenyl succinic acid anhydride with a polyamine ##STR7## where R' is H or a hydrocarbon selected from the group consisting of alkyl, aralkyl, cycloalkyl, aryl, alkaryl, alkenyl and alkynyl group;
• R" is a hydrocarbon selected from the same group as R' except that R" contains one less H;
• a is an integer of about 3 to about 8 and n is 0 or 1, to form a bis-alkenyl succinimide ##STR8## where R is polyisobutylene and x is an integer of 1 to 6;
• (b) acylating said bis-alkenyl-succinimide with a carboxylic acid to form a partially glycolated bis-alkenyl succinimide ##STR9## (c) adding an excess of formaldehyde to said partially glycolated bis-alkenyl succinimide to form an iminium salt of the glycolated bis-alkenyl succinimide ##STR10## (d) adding a phenol to said iminium salt, thereby forming a Mannich base phenol coupled glycamide bis-alkenyl succinimide ##STR11## and (e) recovering said acylated Mannich phenol coupled glycamide bis-alkenyl succinimide.