Where to start.
Found out there is a bunch of information about the M Cars
Not so much on the normally aspirated normal E90, E92
Even less information on the E93.
I guess the best thing to do was to open the hood and see what's there.
Hmmm. Cabin should be an easy enough project. Only six screws with an 8 mm hex head. Well, online they say there is two, the one I needed goes under the hood.
Though the engine looked clean, there was a bunch of leaves and stuff that was trapped by the cabin filter.
First maintenance project done...