I did some searches but could not find any previous posts. Wondering if anyone has done a test with a fleet of identical vehicles (maybe several different car model fleets and randomized city/hwy miles) and compared engine life when running dino vs syth. I have seen the pictures and also wear analysis. I understand the auto mfg's target a 90% survival rate at 150K miles with the OEM recommended fill. Wonder if someone could say I would go to 250K w/synthetic ? Or have prove it out with testing ? This would include all internals including oil pump etc.. I guess there would have to be some pas/fail criteria, like blow-by, oil consumption etc..