Method of changing engine oil

Details Method of changing engine oil Method of changing engine oil

2007-04-24

2007-04-24

Fenstermacher, David M. (Department: 3682)

Lubrication

Automobile crank and gear case service

C123S1960CP

Reexamination Certificate

active

10668070

ABSTRACT:
A method for converting an engine from petroleum based engine oil to synthetic oil, whereby substantially all petroleum based engine oil is removed prior to replacement with synthetic engine oil.

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