Synergistic antioxidant lubricating oil additive composition

摘要

Disclosed is a lubricating oil additive composition which imparts improved oxidation properties to internal combustion engine crankcase lubricants which comprises: (1) an antioxidant selected from aromatic or alkyl sulfides and polysulfides, sulfurized olefins, sulfurized carboxylic acid esters and sulfurized ester-olefins, and (2) an oil-soluble chlorinated hydrocarbon containing at least 6 carbon atoms. Lubricating oil compositions containing this additive composition are also disclosed. Particularly preferred are compositions which also contain an oil-soluble zinc salt.