Dyno means nothing when it comes to oil...
with that said check out the dyno of RP, redline, amoils, greddy, mobil 1, and more here!
http://my.prostreetonline.com/t2540.htm
*cliff notes so far in order of dyno*
350z is on the dyno
-Pennzoil (reported what he already had in the car) - 224.59 hp and 220.46 ft/lbs
-Greddy - 231.52 hp and 224.35 ft/lbs
-Amsoil - 237.49 hp and 223.81 ft/lbs
-Royal Purple - 242 hp and 226.53 ft/lbs (so far...read the link for more info.)
-Mobil 1 - 232.78 hp and 217.43 ft/lbs
You should be more worried about how well the oil will be in your car after a couple thousand miles rather than a dyno....
i use RP by the way...lol