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      09-20-2010, 08:38 AM   #7
Chriztofor
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Drives: '06 325i and '13 X5
Join Date: Feb 2010
Location: Chicago Burbs

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You are lucky they didn't try to void your warranty. Personally, I don't blame them. They are not experts on mods and how they effect the BMW system (if at all).
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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