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      01-04-2021, 09:15 AM   #4
Qsilver7
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Drives: F06 650ix GC / F15 X5 50i
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The n63TU can make noises after shut down...especially the coolant systems (yes systems as in multiple). The two DMEs have a "charge air" cooling system as well as the turbos & engine cooling system. The (3) electric auxiliary pump can be heard running and some of them may continue to run for a short period of time...even after the engine has been shut down to help dissipate heat. Not being there with you...it's impossible to tell if that is what you may have heard or not.

See the illustrations below of the system used after the move to the N63TU engine (which I believe would pertain to the Alpina models, too):
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Last edited by Qsilver7; 01-04-2021 at 09:23 AM..
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