Lubricating oil composition having an ashless wear inhibitor
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United States of America Patent
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Dec 14, 1999
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N/A
app pub date -
Sep 8, 1993
filing date -
Sep 8, 1993
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Abstract
A lubricating oil composition has an oil of lubricating viscosity, plus minor portions of alkylated aminophenol and zinc dithiophosphate. Preferably, about 75 mol % of the alkyl groups of the zinc dithiophosphate are derived from primary alcohols. The alkylated aminophenol can be a borated 4-alkyl-2-aminophenol having, as its alkyl group, a polypropylene tetramer having from 18 to 30 carbon atoms.
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