What oil has zinc now?

I've broke in plenty of flat tappets with 20-50w VR-1 valvoline.
The last one after tear down had a tint of blue[hot] and only with 300psi open pressure [cast iron flat tappet] thats with VR-1.
think what you will of it.

The issue is longevity with the flat tappet cams, kinda like do I run spring pressures on the high side on the street and wear the cam faster, or do I run on the low side and take away that insurance in high rpm's for a longer lasting lobe? = cam wear, fast or slow.IMO