No idea. I was pleasenty surprised at the TBN also. The Motorguard bypass filter has only been on there for the last 2 UOAs. The 2 UOAs before that, I believe I had the Amsoil bypass on it. For the first 220,000 miles, I ran no bypass, just Amsoil and occationally Mobil 1 synthetic. and extended oil drains. Some of them were probably too long. Now it looks like maybe I'll never have to do another drain again. The copper went up as soon as I installed the Motor Guard. I am hoping the reason for the increase is the internal metal parts of the MG are made of copper. Also, after the the MG installation, I did a TP change at about 1400 miles, and after that at about 2000 mile intervals until the first UOA on it. Now I change the TP at 2500 mile intervals. The Jeep now has 296,000 miles(over 17,000 hours) on it. Oil consumption seems to have stabilized at about .5 qt per 2500 miles.