Abstract:
An additive package particularly useful for use in internal combustion engine lubricating oils comprises from 30 to 80 wt. percent of a nitrogen-containing dispersant made by reaction of an alkylene polyamine with a mono- or dicarboxylic acid or anhydride substituted with a C50-C250 essentially hydrocarbon chain, 3.0 to 30 wt. percent of an antiwear agent prepared by reacting a terpene, petroleum fraction or 500-20,000 molecular weight C2-C6 polymer with a phosphorus sulfide, and 3.0 to 30 wt. percent of a phosphothionyl disulfide of a C1-C18 alkyl phenol as an antioxidant.