I'd be interested in the non-detergent "screwed-up motor syndrom" too. Like Mr. Fixit, I've been using it for many years in high performance engines. Just for grins.....how many of you use Kendall GT-1? I do, and it's a non-detergent racing
oil. It was the recommended
oil by my builder who also builds NASCAR and Winston Cup engines.....none of which ever see a detergent
oil!!! I'm not sure about this and feel free to correct me, but I don't think any oil specified as racing oil is a detergent oil....at least none I ever used was.
On the viscosity, again at my builder's recommendation, I use Kendall GT-1 20w-50 year around. Acts like 50w when the engine is hot and like 20w when it's cold. That's what multi-vis oils are supposed to do.....or so I'm told and it works well for me and a lot of other folks with trick engines.
Al