I ran Mobil 10w40 with a zinc additive for years in the B1 and B2. The bearings on both engine looked great at teardown. The B1 a couple of years ago and the B2 just recently. Since the B1 O/H I am now running Amsoil 10w40 that has the zinc in it. I used the 30wt Amsoil break-in oil during...