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Is your engine basically the same, with larger displacement, as that in our 2005 325ci? I'm going to peek underneath and see how the top end of the crankcase is ventilated. I wonder if when crankcase pressure builds, the whistle is blow by of some sort...?
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2004 X5 4.4i Sterling Grey/Black Sport Prem 132s/Diamaris Rear Climate OEM Nav/Sirius RBs AngelBrights Roundel Valve Caps, 35% front tint. Sold MArch 2012
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