Quote:
Originally Posted by skalberti
Bulldog, if you have a 2012 35i, open the gas tank door and read the white lettering. It says 89 octane
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Confirmed. My 2012 X5 N55 gas cap says the min is 89. However, my 2011 535i says the min is 91. I run 93 on both cars, I'm not taking chances of any knocking or pre-detonation.