Quote:
Originally Posted by UFO
I think you'll find that used motor oil (uncontaminated with other substances) has no issues with viscosity. The reason oil is changed is the additives are consumed, not because the oil itself breaks down. Read the thread "Changing oil is un-necessary".
New motor oil has the same lubricity as used, within reason.
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The oil its self will break down. From the experts with no profit motive other than to get you to test your oil
WearCheck FYI - Oxidation and Oxy-polymerization of Oils