If synthetic oil is causing bearing failures, I wonder why Warren Johnson, Bill Jenkins, Spenny Clendenen, David Reher, Richie Gilmore, Randy Dorton, and so many other people who make millions of dollars building engines for racecars (and the best and fastest cars in the world) use oils like Redline, Amsoil, and Mobil 1. And why does GM use synthetic oil in the Corvette engines? Seems to me if synthetic oil was causing problems, GM would sure as hell try to avoid having to do a lot of warranty work on all of those engines. Simply put, synthetic based oils are the best lubricants there are. The rest is a crock.