I hope you guys are talking about low wear high mileage motors,. If you were talking about motors that don't typically last more than 30,000 miles then you would be dead wrong. Synthetics OBVIOUSLY work better than dino oils in things like race engines, hot rodded engines, and dirt bikes. That is enough to put me over the fence on the dino vs synthetic argument. When I see the results in engines that typically don't last very long, synthetics are an obvious choice. I take that expereience and apply it to passnger cars where I will never live to see the final results. Sure, it is not 100% scientific proof that synthetics work better, or they may never pay for themselves. But is is not like a I am basing a decision on "marketing hype". There is real expereience that goes along with it. I once posted a thread about all the common engine failures I had seen in street cars that are related to damage from oil breaking down. These were real world observations based on years of experience. Lots of cars end up with issues directly related to poor lubrication. Ever heard of a turbo bearing failure? Ever heard of a stuck engine valve or stuck piston rings or a failed crankshaft oil seal? These are lubrication failures that are alleviated by modern synthetic oils. And lets not forget that synthetics come with the better additive packs in the oil. Try finding a conventional oil that comes with a top of the line additive package anymore. There is plenty of evidence that synthetic oils work better than dino oils if you lok for it. Sure there is "confirmation bias" in my approach, I am looking for improvements so I find them. Nonetheless to even HINT that there is no evidence synthetics work better than dinos is just plain wrong. There is plenty of evidence, whether it is worth it to you in your application is another story.