Zinc oil additives

Flat tappet cam: VR-1 10w-30 is my go to if I have some valve spring pressure. If it has the weak stock valve springs of a stock engine, and if it's already been broken in with some miles on it, I will just use Rotella T4.

• Yes, i have used different types of zinc additives and they have worked as well, including ZDDPMAXX