My thoughts are that a detergent oil is more efficient at "moving" the contaminants to the filter.
I worked with a guy who used only SAE30 non det in his 350 chevy V8 and what one could see of the rocker arms thru the fill cap looked great...almost like new despite 100k+ on the engine. However my thoughts are that stuff builds up in the pan as a result.
Engines run with normal detergent oils look more "uniformly dirty" but that IMHO is a result of the first paragraph...the oil is trying to "dissolve" and move crud around.
Long story short, I personally would advise that you should clean as much as you can mechanically, then put it back together and run it for a few hours before changing the filter again.
Classic application for a non-detergent is something like a geared-head lathe where you want contaminants to settle out to a nice quiet corner and then possibly get removed 20 years later when some enterprising person decides to rebuild the headstock. But...if they never got removed...no harm would be done. An IC engine is a more dynamic and different situation because contaminants are constantly being "generated".
This post was edited by mattofvinings at 17:49:05 03/01/09.
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