Since you seems to be an expert on Auto-RX and what i have understood that you use synthetic oil after theatment, do you still use the stuff like they recommend according to maintainance plan or do you just trust that more cleaning synthetic oil willl keep your engine clean?
After the treatment , the synthetic does the job.
I had a long talk with the juy who invented teh stuff and it was originally made for maintaining the gearboxes on commercial printing presses( those 2 block long machines for newspapers ) and then some of the maintnence guys started putting it in their cars, the rest is history, but it used to be that commercial presses required synthetics to continue operating and part of what he was doing was to lower the maintnence requirement on those things, as they usualy had to be drained for cleaning anyway, no real extended drain advantage there, so he has a bit of a anti synthetic bias.