Abstract: A method for producing an ashless, antioxidant lubricating oil additive. The method comprises:(a) reacting an alcohol with phosphorus pentasulfide to form a dithiophosphoric acid intermediate;(b) treating the dithiophosphoric acid intermediate with an expoxide to yield a corresponding dithiophosphoric ester alcohol product; and(c) recovering the dithiophosphoric ester alcohol product lubricant oil additive.

Abstract: The present invention provides a lubricating oil additive which provides anti-wear properties to a lubricating oil. The additive is the reaction product of 2,5-dimercapto-1,3,4-thiadiazole and a mixture of unsaturated mono-, di-, and tri-glycerides. The present invention also provides a lubricating oil additive with anti-wear properties produced by reacting a mixture of unsaturated mono-, di-, and tri-glycerides with diethanolamine to provide an intermediate reaction product and reacting the intermediate reaction product with 2,5-dimercapto-1,3,4-thiadiazole.

Abstract: A diesel fuel composition which is comprised of:(a) a major portion of a low-sulfur content diesel fuel; and(b) a minor amount, as an anti-wear lubricity additive, of a dithiophosphoric diester-dialcohol.

Abstract: An adduct of 2,5-dimercapto-1,2,4 -thiadiazole, an epoxide, a formaldehyde and 4,4'-isopropylidenediphenol represented by the formula ##STR1## where A is H or ##STR2## where R is H or a (C.sub.1 -C.sub.30) alkyl group and n=1-4.

Abstract: Beta-hydroxyalkyl-bis(alkylthiomethylphenyl) dithiophosphate esters represented by the formulas ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each H, a (C.sub.1 -C.sub.40) alkyl group, --CH.sub.2 SR, --C.sub.6 H.sub.5 or --C.sub.6 H.sub.4 --R.sub.5 providing at least one of R.sub.1, R.sub.2 and R.sub.3 is --CH.sub.2 SR; R.sub.4 is H or a (C.sub.1 -C.sub.40) alkyl group; R is H or a (C.sub.1 -C.sub.40) alkyl group, --C.sub.6 H.sub.5 or --C.sub.6 H.sub.4 --R.sub.5 ; and R.sub.5 is a (C.sub.1 -C.sub.40) alkyl group.

Abstract: A process for preparing a zinc dialkyldithiophosphate which comprises reacting phosphorus pentasulfide with an aliphatic monohydric alcohol in the presence of a hydrocarbyl polyol followed by a reaction with a basic zinc salt to produce a stabilized zinc dialkyldithiophosphate is provided.

Abstract: A lubricating oil additive is prepared by reacting a triglyceride with a basic nitrogen compound to form a reaction product, reacting said reaction product with an acidic molybdenum compound to form an intermediate reaction product, and reacting said intermediate reaction product with a sulfur compound to produce a lubricating oil additive.