Medium speed diesel engine oil
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United States of America Patent
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May 20, 2008
Grant Date -
Nov 2, 2006
app pub date -
Apr 29, 2005
filing date -
Apr 29, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A lubricating oil having a CCS viscosity at -15.degree. C. less than 7000 cP, good shear stability, and a TBN between 8 and 20 comprising: a) a lubricating base oil made from a waxy feed, b) an engine oil additive package formulated to protect silver bearings, and c) less than 2.0 wt % viscosity index improver. Also a process to make a lubricating oil having a CCS viscosity at -15.degree. C. less than 7000 cP, good shear stability, and a TBN between 8 and 20. Additionally, a lubricating oil having low CCS viscosity comprising specified amounts of lubricating base oil made from a waxy feed, engine oil additive package formulated to protect silver bearings, up to 55 wt % bright stock with a VI greater than 120, and no viscosity index improver or conventional pour point depressant additives. Also, a method for operating a railroad engine using the lubricating oil of this invention.
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