Abstract: Lubricant compositions are provided, comprising oils of lubricating viscosity, and greases prepared therefrom, containing a minor antiwear improving amount of an alkyl beta-thiopropionic acid ester.

Abstract: Lubricant compositions are provided, containing an antiwear amount of a compound having the structure Y(CN).sub.n in which n is a whole number from 2 to 6 and when n is 2, Y is alkylene, phenylene or benzylene, when n is 3, Y is a tris(ethyleneoxy) paraffin having from 3 to 12 carbon atoms, when n is 4, Y is a tetrakis(ethyleneoxy) paraffin having from 4 to 12 carbon atoms, when n is 5, Y is a pentakis(ethyleneoxy) paraffin having from 5 to 16 carbon atoms, and when n l is 6, Y is a hexakis(ethyleneoxy) cycloparaffin having from 6 to 16 carbon atoms.

Abstract: Lubricant compositions are provided, containing as antiwear agents, a .beta.-thiopropionitrile having the structure R--S--CH.sub.2 CH.sub.2 CN in which R is alkyl, nitriloalkyl, aralkyl, alkaryl, aryl, or benzothiazolyl, mercapto-thiadiazolyl, NCCH.sub.2 CH.sub.2 --X--(CH.sub.2).sub.n where X is oxygen or sulfur and n is a whole number from 1 to 20. Particularly contemplated are lubricating oils and greases containing the aforementioned antiwear agents.