Quote Originally Posted by 36 sedan View Post
BTW, I've heard the formula has changed for Rotella oil and may no longer have enough zinc additive to protect a flat tappet cam.
I believe that's true. New regulations on diesel emissions led to a drop in ZDDP in Rotella's oils a year or three back. If I were running a flat tappet cam I'd spring for Brad Penn's oil. Some say that once you've got a good break in that any major oil is OK, but I'd say that's playing Russian Roulette with your engine - at what point is it going to fail?