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      10-10-2012, 07:56 AM   #6
First Lieutenant
Drives: 330i
Join Date: Aug 2006
Location: NJ

Posts: 353
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I think you're hearing an air pump that kicks in during cold starts. The ones in BMWs always seem noisy - I complained about it in my wife's X3 and they first told me it was normal, but eventually replaced it, much quieter now!

Actually just listened to the video again - if you're mean those momentary metallic rattles, not so sure it's the air pump...
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