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Old 03-22-2011, 11:52 PM   #16
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Join Date: Mar 2006
Location: Southern California
Posts: 23,846
My Ride: M54B30
I've pressure-washed my past 6 BMW engine bays without any issues whatsoever, along with various other makes/models. You just have to be precise with the nozzle and avoid spraying critical areas directly. Even then, I doubt any damage would occur. Electronic components in engine bays are sealed a lot better than you'd think.
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