Zinc Additive for Flat Tappet break-in?

The typical VR1 is now SM also. It has higher zink that most, but still too low. The good stuff is labeled "not legal for use in on road vehicles" or something like that. It's I think only in 10-30 or 20-50 wts. I use and recommend that for cam breakin, and then VR1 straight 30 wt for use after that. I think Crane, Comp Cams, and Hughes have all the same basic stuff. If you are contemplating running an aggressive flat tappet cam lobe, you need to know what you oil it with. Otherwise, just go roller cam.