Quote:
Originally Posted by hmmcolor
335 requires 91, which makes it awesome when you're in Northern Texas and they only have 86/88/90.
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Actually, 91 octane is HIGHLY recommended by BMW, but they say you can use 89 with no effect on engine life (but you might hear knocking sounds when in warmer weather).
I could probably get away with using 89 where I live since the weather is not going to be getting any warmer than the 50's, but I'm going to stick with 91 just cuz the extra anti-knock give me a warm fuzzy feeling.