It's not your father's Oldsmobile




However, it was observed that engine oil samples collected from fleet vehicles after 12,000 mile drain interval showed 10-15 % lower friction and more importantly, an order of magnitude lower wear rate than those of fresh oils.
http://papers.sae.org/2007-01-4133/
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Last edited by Serndipity; Aug 6, 2010 at 07:07 AM. Reason: add time of change intervals


