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Since I picked up M3, I have been hearing a humming sound that is intermittent on high revs, especially in 3rd gear, this worries me and I thought it would go away but it hasn't, is this normal like the clunking sound, or should I take it in? Any of you have this problem?? TIA
 

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I only hear a slight humming sound for about 10-15 seconds after I start the car when it's cold. It then goes away and I never hear it again until I start the car when cold.
 
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