I'm going to be changing my oil pretty soon and i'm not sure which I want to go with... I've searched the boards, but haven't found anything specifically for the 4.8is..

BMW 5w-30 (it's BMW)

Mobil 1 0W-40 (good coverage but can only purchase US-made version)

Castral Syntec 0W-30 (German-made version available.... But will 30 be enough coverage for summer here in Halifax (never get's higher than 80F)?? I'm also worried that the 30 will not be enough coverage for higher RPM's)

Of the three, which do you guys recommend??