Per Circle Track magazine, they say "at least through flat tappet break-in" I think I will try and contact Comp Cams on Monday about what to use after break-in. I like the Rotella too with the exception of the viscosity rating for the
synthetic - 5W-40. I wish there was a 20W-50. "Paranoia" You bet! What else is there to do but worry about these cars.