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As far as extended engine life , it simply follows that less wear translates into longer engine life as long as another cause isn't created like an extreme lean condition for example.



I can agree that synthetics offer certain benefits over conventional oil stocks, perhaps the most significant being cold weather flow, yet to the best of my knowledge, it has never been independently proven that the use of synthetics equates to less wear or longer engine life. With around 30 years of high quality synthetic oil availability, that seems a curious issue to me.

In all sincerity, If I'm wrong, please show me the proof. Me and a few thousand motor fleets want to see it.