Thread: Dirty Engine
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      09-21-2017, 03:53 PM   #5
wcr3d
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Drives: 2013 535i XDrive M Sport
Join Date: Aug 2012
Location: Indiana

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Air must flow. Sure it is not air tight. From the bottom is the largest opening and of course the dirtiest one. Look around to see how much cleaner it is compared to other makes.
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