Not to turn this into a BITOG oil fight, but I used to run conventional in all of my cars and I cannot recall any of them having less than 250k miles when they were retired due to rust or sold. My old '92 V6 T-Bird was all conventional and ran a LOT of Fram filters. When the rear upper shock mounts rusted out at 260k the engine ran great and burned no oil. I think it is more about regular maintenance most of the time than what brand oil or filter you are using. Now, late model garbage with all of these variable valve timing solenoids and other crap, yeah, I'll put synthetic in those since they seem so sensitive to everything. Oh, my lawnmower runs conventional oil.