i just spoke to a castrol rep and they say they just reently offered here in the usa a direct Dexos 2 approved oil for us. Its Castrol Edge 5w-40 c3 . here is a link to its specs
Changed oil from Mobil1 ESP 5w-30 to Castrol Edge Euro 5w-30 02209366, 06669, I cant believe the change in engine noise.
I was getting a clack (cant really explain it) its completely gone with the Castrol Edge Euro if it comes back I will update this thread.