Cam change

My understanding has always been that, once the cam is broken in, the process is done. Work hardening of the lifter faces is the process. So after the usual high RPM initial running, and then some driving for a few 10's of miles or whatever you feel comfortable with, then you can change.

Just out of curiousity, I looked at this HPS oil and cannot find the zinc or phosphorous PPM numbers. Anyone know them?