Originally Posted by denyo77
oh I really don't know how American cars can run on such bad fuel...
the worst quality you get here is 91, and you can't even get that in most countries. Usual you fuel up with "Super" which has 95 octane, "Super +" has 98 octane and V-Power or other HP-fuels have 100 octane.
But to answer your question at least partly, my E30 325i CAN be run on 91, so the knock sensor should in theory not be the problem, but I would recommend 95 because the engine runs a lot more smooth and feels faster
Different method of calculating the pump octane in the US vs Germany
V-Power here is 92 octane