This isn't a big scientific test or anything - but Aaron and I did dyno our cars with old Mobil 1 (done about 3500 miles on it), then changed the oil, Aaron got Amsoil, I did the ULX-110 and we dynoed them again after a run around a big block.
Dyno graphs were inconclusive - they varied just as much without the oil change.
The Amsoil hasn't been lab tested after being in the V8.
I have one sample of ULX-110 back, another is on the way. Results were within spec, but did contain the highest concentrations of wear metals I have ever recorded.
The local Mobil distributor sell drums of mineral oil to ULX where I live, ULX add stuff like Molybdenum and resell it.
8 samples back from the lab so far for my SC400 - intervals roughly average 3000 miles. All the oils have been ok.
See the all results and the dyno graphs here:
http://planetsoarer.com/OilAnalysis/OilAnalysis.htm

 

good stuff!!

a buncha my friends are Amsoil distributors over here and they keep trying to move me over from Mobil- and I would have if the prices werent so damn expensive

cant wait to see the lab results

 

Amsoil turbo formula if your boosting, Mobil 1 if your not
Just my opinion