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Old 07-13-2011, 08:59 PM   #17
Sir Binkley
Registered User
Join Date: May 2011
Location: Saskatoon, Saskatchewan
Posts: 8
My Ride: 2004 330xi
On my 2004 330 whistle turned into squeal after car warmed up. Finally traced it down to gummed up oil separator valve & piping. Car was starved for air after it warmed up and was pulling air thru the crankcase seal. Easy way to tell was remove the oil cap and start it up. Whistle was immediately gone as vacuum had a new source of air. Gumming up condition is a known problem and BMW has a larger diameter oil dipstuck tube, insulated valve assembly etc. to fix it. Often caused by numerous short trips. 3.8 hrs of mechanic time & parts cost me $1,000 though.
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