Extreme pressure lubricating compositions

Claim 1

An extreme pressure, anti-wear lubrication composition consisting essentially of a major amount of a lubrication oil and a minor amount of an extreme pressure, anti-wear additive consisting essentially of a mixture of a sulfurized diester and sulfurized alcohol, said additive having been obtained by reacting a dicarboxylic acid of the formula: ##STR6## wherein m is an integer of from about 1 to about 10, or a dicarboxylic acid anhydride of the formula: ##STR7## wherein m is defined above with a linear unsaturated alcohol of the formula: CH.sub.3 (CH.sub.2).sub.n CH═CH(CH.sub.2).sub.x CH.sub.2 OH wherein n is an integer of from about 5 to about 15, and x is an integer of from about 4 to about 11, resulting in a diester defined by the formula: ##STR8## wherein m, n and x are as defined above, combining said diester with a linear alcohol of the formula: CH.sub.3 (CH.sub.2).sub.n CH═CH(CH.sub.2).sub.x CH.sub.2 OH wherein n and x are the integers defined above and sulfur and heating said reactants to obtain said mixture of a desulfurized diester and sulfurized alcohol, wherein from about 6 weight percent to about 20 weight percent of said combined sulfurized diester and sulfurized linear alcohol comprise the sulfide moiety and the sulfurized diester and the sulfurized alcohol are present in a molar ratio of about 200:1 to about 2:1.