| abstract |
A lubricating oil additive composition which imparts improved oxidation properties to crankcase lubricants comprises an antioxidant selected from aromatic and alkyl sulfides and polysulfides, sulfurized olefins, sulfurized carboxylic acid esters and sulfurized ester-olefins, and a secondary amine of the formula: <IMAGE> wherein R and R' are aliphatic radicals. Lubricating oil compositions containing this additive composition are also disclosed. |