Marine diesel engine lubricating oil composition having improved high temperature performance
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United States of America Patent
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Apr 22, 2003
Grant Date -
Sep 5, 2002
app pub date -
Nov 14, 2001
filing date -
Feb 14, 2000
priority date (Note) -
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Abstract
A lubricating oil composition containing a base oil of lubricating viscosity, overbased sulfurized alkylphenate detergent or its calcium salt, an overbased alkylsulfonate detergent or its calcium salt, an ashless dispersant, and a zinc dialkyldithiophosphate and/or zinc diaryidithiophosphate is described. The lubricating oil composition provides improved heat stability and anti-wear performance in marine diesel engines operated under severe conditions where the cylinder liner temperature may reach 200 to 260.degree. C.
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