Low phosphorous engine oil compositions and additive compositions
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United States of America Patent
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Oct 29, 1996
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N/A
app pub date -
Aug 27, 1993
filing date -
Sep 14, 1992
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Abstract
An engine oil composition having a base oil, an ashless dispersant, a metal-containing detergent, zinc dithiophosphate and a sulfur-containing phenol derivative. Examples of sulfur-containing phenol derivative include 2,4-bis{(octylthio)methyl}-o-cresol, 2,2-thiodiethylenebis{3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate}, and tridecyl 2-(3,5-di-ti-butyl-4-hydroxybenzylthio)acetate.
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