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Not sure how similar the engine in the M6 is to the 2013-2019 N63TU in the 650....but the N63TU has two separate cooling system. One is for the engine cooling...and the other is for the charge air cooling (to cool the turbos) and the two engine DME.
On the n63TU...the charge air cooling system reservoir is up front and center...and when you screw the cap off you can see the MAX fill line. The reservoir for the engine coolant is in the left front fender and the fill pipe is at the rear left of the engine bay (on the rear right if you're standing in front of the car looking toward the cabin.
See the info below as to how to check the fill pipe for the N63TU...if the engine in the M6 is similar...the fill pipe is probably similar, too:
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2015 F06 650ix Gran Coupe`(Moonstone/Cohiba Brown)| 2014 F15 X5 50i MSport (Space Gray/Mocha)
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