Hydroxyalkyl hydroxy-aromatic condensation products as fuel and lubricant additives

A lubricant composition comprising a major amount of at least one lubricating oil and a minor, but engine sludge dispersing, amount of a product made by the process comprising reacting (A) at least one alpha hydroxyalkyl hydroxy aromatic compound of the general formula ##STR22## wherein Ar is a hydrocarbyl aromatic nucleus of 6 to about 30 carbon atoms, each R is a nonfused hydrocarbyl group of about 25 to about 700 carbon atoms, each R' is independently a hydrogen atom, an alkyl group of 1 to 36 carbon atoms, or a halogen-substituted alkyl group of 1 to about 36 carbon atoms, n is 1 to 3 and m is 1 to 5 with the provisos that (i) the total number of carbon atoms in the R' groups does not exceed 36 (ii) where m exceeds 1, one of the R groups can also be a ##STR23## group, with (B) at least one hydrocarbyl, alpha-beta olefinically unsaturated compound selected from the group consisting of C.sub.2 -.sub.40 carboxylic acids and anhydrides, esters, and amides thereof;

• the reaction of (A) with (B) resulting in the formation of carbon-to-carbon bond, said bond including the carbon of at least one ##STR24## group.