In my experience, I am guessing he is NOT running Diamond mc chain.. or he is lubing it with water..
I am trying my first O or X ring chain, a lightly used that was a gift from a buddy..
It has marked up the case on the 750, and I find I am oiling it quite a bit. I run aluminum reat sprocket, and cant watch that running dry.
Because I am noticing that, I am surmising that while O-ring chains give better chain life, I am thinking that they atre having worse sprocket life.. than a well maintained regular chain..