Good links to the vacuum link threads. Never thought of that angle, but it makes sense. Here's a little more basics from your very knowledgeable poster.

http://www.xoutpost.com/bmw-sav-foru...v-details.html

Note: my x5 had the valve cover gaskets replaced at the dealer.

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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005