[UFO]

Originally Posted by ConnClark

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

We are not talking about over-extended change intervals, the test oil was 5k miles, within a normal change interval. Anti-oxidation additives will certainly last that long. I've had oil tested at 10k miles with nothing out of spec, so I doubt you can make the claim the oil lubricity is significantly changed in 5k miles, or 10k for that matter.