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I've heard that also. But I've never heard any facts to back it up. Common sense would say that lubrication is pretty straightforward. I can't believe that the metallurgy would be changed by one kind of oil over another. So wouldn't the new oil, of whichever variety, just mix with the few remaining drops of old oil? What could possibly be so complicated? You had yours completely apart; did you see anything inside that looked delicate?