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Old 10-18-2009, 08:35 PM   #7 (permalink)
orange4boy
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There is a study in your list, Tasdrouille, that shows an advantage for synthetics in a diesel engine.

http://me.engin.umich.edu/autolab/Pu...e/P2002_03.PDF

It's small (10% less friction for the best synth over the base non synth) but every bit counts. This study does not test for cold performance which possibly would give greater returns.
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