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      12-05-2011, 03:51 PM   #4
BMWNTHZST
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Drives: 2011 E92 M3
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1997 BMW 840CI  [5.00]
2011 BMW M3  [3.50]
2008 BMW 335i Conve ...  [4.20]
2004 BMW M3  [4.50]
Warming up the engine
During the warm-up phase, the high-performance V8 engine runs a little more roughly due to its emissions control system.

For technical reasons, the exhaust systems sounds slightly metallic when the engine is cold.

This information can be found in your manual on page 121
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