www.blackstonelabs.com

Get your oil analyzed to see how many contaminants are really in it by the time you change it.

Subaru of America just released a list of the only synthetic oils they recommend on newer subarus. Here's what they listed:
Amsoil ASL High Performance 5w30
Amsoil XLF Extended Life 5w30
Castrol Syntec 5w30
Mobil1 5w30
Mobil1 Extended Performance 5w30
Pennzoil Platinum 5w30
Redline Synthetic 5w30
Valvoline SynPower 5w30

I'm convinced that 5w30 is just too thin for turbo cars in this heat so I'm running heavier 10w40. The eurospec Castrol Syntec 0w30 is supposed to be pretty good too.