BORON FREE AUTOMOTIVE GEAR OIL
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United States of America Patent
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app pub date -
Oct 25, 2006
filing date -
Sep 25, 2003
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Abstract
The present disclosure provides a method for lubricating a gear or transmission comprising contacting said gear or transmission with a lubricant composition wherein said lubricant composition has an ISOT score of about 3.0 or lower for varnish on the glass beaker or glass rod and a L-60-1 carbon/varnish (C/V) rating of at least about 7.5 and a L-60-1 sludge rating of at least about 9.4 and wherein said lubricant composition is substantially free of boron and has a total phosphorus content of less than about 500 ppm The present disclosure also provides a method for providing a boron-free lubricant composition capable of achieving a satisfying score on the ISOT test and the L-60-1 test comprising combining with a base oil, a lubricant additive package comprising a dispersant. and wherein the lubricant composition is substantially free of boron and has a total phosphorus content of less than about 500 ppm.
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