Lubricant composition for automobile driving system
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United States of America Patent
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Issued Date -
Dec 1, 2005
app pub date -
May 6, 2005
filing date -
Jun 1, 2004
priority date (Note) -
Abandoned
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Abstract
A lubricant composition having a 40.degree. C. dynamic viscosity of 40 mm.sup.2/s or less that has wear resistance equal to or better than a lubricant having a 40.degree. C. dynamic viscosity of 76 mm.sup.2/s is achieved by providing a base oil with a zinc dithiophosphate and alkaline earth metal salt in an amount to provide a ratio of elemental zinc to alkaline earth metal in the oil in the range of 0.2 to 1.0.
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