I am not going to try to answer your question since I'm not a lubrication engineer. Oil does not wear out but there are other factors which determine the interval for changing oil such as operating conditions, climate, how hard the engine is worked and length of trips etc.. as CCJohnson put it "I can buy an awful lot of oil with the +/- 25K it takes to replace an engine"
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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