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      05-02-2018, 01:37 PM   #57
CobraMarty
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Drives: 2007 328xi e90 + e92
Join Date: Sep 2010
Location: BimmerMILVs.com

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It's a drain for the SC oil. The fill is on top of the SC housing, drain on the bottom where you can't get to it unless you pull the SC. They recommend oil change every 7500 miles.
So it is just for ease of oil change/drain.
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