after your mech. cam is broken in you don't need zddp anymore. WRONG - higher spring pressures in performance applications can still wipe a flat tappet cam. frankly, you shouldn't need zddp during breakin either. 40 years later I would think that castings would be much better. WRONG - metalurgy is often crap, especially with the recycled metal we get back from China. certainly todays oils are light years ahead of the "old school" oils. They are - for newer OEM roller cam applications. That, mileage and emissions have priority.
