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      01-03-2013, 02:34 AM   #3
nospam
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Drives: 2015 Alpina B6; 430i; X5 40e
Join Date: Jul 2010
Location: Orange County, CA

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91 is recommended, but 89 is allowed by BMW on the N20 engine. It won't void your warranty and shouldn't damage anything, you'll just sacrifice performance.