It doens't matter which bypass filter you use, the oil will turn black. Like I said before soot is submicronic and really cannot be filtered out of the oil.
Speaking of how small particles that can be filtered the Amsoil filter say's 1/10 of a micron as well. Exactly how effecient is the question. It seems ralph say's the same thing over and over again, 40 years he's been using this and that, and that oil has no bering on the wear and performance of an engine yada yada.... But I never see any analysis program, no particle counts and so forth.
Another thing is that only about 10% of the oil is flowing through the by-pass filter at any one time ( I would guess even less with the TP becuase of small surface area of the filter) So there is still going to be soot in the oil no matter what (there will be soot anyhow because the TP is only effecient down to 1-2 microns. I would venture to guess it's not 95% at 1 micron for any lenth of time, as it would loose effeciency after a few thousand miles,(hence the reason for frequent filter changes) which I guess is reason it's much cheaper to just change the TP and top off then get a used oil analysis.
