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Don't know if they still do this, but back when I worried about such things, many oil companies sold "racing oil". The one I used(Valvoline) said non-detergent.
So maybe modern racing oils are still non-detergent. Worth a look at the lable anyway.
[updated:LAST EDITED ON 01-12-03 AT 08:03 PM (EST)]One of the dirt cheap walmart brands is also a non-detergent.
The thread here (BrianA's Cheap oil test thread has it in there somewhere.)