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      02-02-2013, 05:20 PM   #1
BMdriver
Bus Media, Xenons, Spt Auto, Sun Pro Black Panel
United Kingdom
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Drives: F30 320 D M Sport
Join Date: May 2006
Location: Merseyside

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320 D engine tone from cold start

On these cold mornings, there is a medium tone/pitch noise which increases when the engine is revved. I can only describe this as 'turbo whistle'. This does go completely once the engine has warmed up after a mile or two. Is this normal because I have read somewhere that the turbo's work differently until they have reached optimum temperature. Does your 320 D have this characteristic?
Thanks in advance.