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      09-01-2012, 07:33 AM   #21
RWS-F30
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Drives: 2012 BMW 328i F30
Join Date: Aug 2012
Location: Aurora, OH

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Run 91 Octane

On the four cylinder the manual said you could use 89, but when you do, it may throws a code to the computer that the turbo is running lean. It doesn't hurt the engine. But you may have problems down the line. For a few cents more a gallon run 91.
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