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The evidence is derived from the fact the former use PAO/Ester based synth base stock, whereas the latter use hydrocracked mineral oil.
As for severe schedule maintenance - I should clarify that that pertains to the hydrocracked oils rather than the true synthetics, but not exclusively.
I'll see if I can dig out the link to where it was stated that oil degradation and therefore usefulness was reached with that sort of mileage - 5-7K miles.
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