Alkylated thiophene lubricants

A process for the preparation of a high-temperature stable lubricant fluid or lubricant additive consisting of catalytically reacting in the presence of a fluid catalytic cracking zeolite catalyst (1) a hydrocarbyl moiety, having at least one olefinic group and optionally containing S, N, O, P, F, or mixtures thereof, and (2) a thiophene and wherein hydrocarbyl comprises cyclic, linear or branched containing from 3 to about 500 carbons wherein the reaction temperature varies from ambient to about 350.degree. C., the molar ration of hydrocarbyl moiety to thiophene varies from 1:1 to about 10:1 and the amount of catalyst varies from 5 to about 100 grams of catalyst to about 1 mole of thiophene.