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      11-29-2012, 11:55 AM   #19
Yoyoniner
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Drives: -
Join Date: May 2012
Location: US

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The manual says that 89 octane (not 91 or 93) is the required fuel. So I'm sure the engine is tuned for 89 octane, unless BMW made an error in the manual and on the fuel filler door.