Dartley, I agree that the past conversation was pretty all incompassing but if you want to sum up, some of it, the flat tappet cams need the zinc package all the time at a concentration of 1200ppm minumum. During breakin a person would ad the cam manufactorers oil suppliment to the oil which would bring up the zinc concentration, among other things, even higher. By the way I think the rest of your comments are bang on.
Terry
