What makes German Castrol such a good motor oil? How is it different then American 0W-30? What makes it different then the rest of the America Castrol Syntec line? Why do you think it is better then Mobil 1, Amsoil etc.? I see alot of GC love here, and have to admit being sucked in a bit to the point that I picked up a case...just because. But after reading all the UOA's and comparing it to M1, Amsoil, etc...I have come to the conclusion...no matter how flawed my view, is that it's a good oil, but not heads above the rest.