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      07-27-2010, 11:26 PM   #25
RatchetM3
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Drives: 2011 E92 M3
Join Date: Jun 2010
Location: FL

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It could be the Fuel. Gasoline below AKI reading of grade 89 will "produce knocking sounds when starting at high outside temperatures. This has no effect on the engine life" - BMW manual

I don't know much, just guesing I saw that as I was browsing the manual.
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