IDK but hookers and blow might be more expensive. Maybe maybe not.
Pops and his Porsche buddies all swear by mobile 1. My tech likes Motile vt300. You guys say Amsoil. I am guessing all 3 are fine, the trend seems to be use synthetic expensive oil. check.
If you guys are interested here's my old man at Mid Ohio this past sunday in his 997 S. Unfortunately we can't race unless one of us rents a helicopter and cargoes our car to the other side of the country.
Mid Ohio PCAP May '13 - YouTube