Abstract: A lubricant additive composition for use with petroleum base lubricant media. The additive is formed of an admixture of about 1 to about 3 parts by weight copper metal flake or powder particles having a size of about 1 to about 2 microns, about 2 to about 4 parts by weight chromium metal flake or powder particles having a size of about 1 to about 2 microns, about 1 to about 3 parts by weight zinc metal flake or powder particles having a size of about 1 to about 2 microns and about 2 to about 4 parts by weight molybdenum disulfide particles having a size of about 1 to about 2 microns. The additive is admixed with a petroleum base lubricant in the weight ratio of from about 0.001 to about 0.015 parts by weight additive per part by weight lubricant medium. The lubricant and admixed additive, when utilized in an internal combustion engine, increases the engine compression and reduces noxious emissions.