Quote:
Originally Posted by HT1000
See SAE Technical Paper 2003-01-3119 on oil change frequency. New oil increases wear over used oil.
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Did you get the paper # correct? The paper you specified is titled
"Antiwear Performance of Low Phosphorus Engine Oils on Tappet Inserts in Motored Sliding Valvetrain Test"
and it analyzes the antiwear capability of phosphorus in oils only.