Quote:
Originally Posted by UFO
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.
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But I can make the claim that it had particles of soot and metal in it which contributed to the wear in the test.