1999 BMW 328 Engine noice/whistle

1999 BMW 328
145,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MAHILUCK
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I did an oil change today in bmw 328i(1999) with the filter replaced , after that there is a whistle like noice come from the engine when you remove or loosen th e oil cap sound disapperes , idle speed is fine.@800rpm. can you please let me know what could be the problem ?

Mahi from San clemente CA.
Jan 21, 2008 at 3:32 PM
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DOCHAGERTY
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The cyclone separator is the noise maker, they fail all the time. Go to amazon.com for a Bentley repair manual
Feb 24, 2008 at 12:20 PM