I think that most people do not understand how well some ester clean. I also think that most people have no idea what tpe of deposits are in their engine. Another key point to remeber is that few labs can give you a good oxidation or nitration number with Redline or any other heavy ester base oil.
One of the benifitts of Redline is what it does not leave behind! I have never seen an engine feed a steady diet of Redline ever have varnish or sludge. I am sure it is possable but I have never seen it.
Products like Auro-Rx, 131, LC, Amsoil Flush etc. all try to remove what your oil leaves behind. I think it would be safer to not leave so many deposits behind in the first place.
This is one reason I am so interested in German Castrol. THe idea of a mass marketed ester based oil with large scale distribution is exciteing. So far none of my AUtozones have had it.
While wear metal reduction is great it is my personel and professional opion that deposits are a greater area of concern!