I see nothing in the lease language that would make adding OEM 20's to the car a problem...

Now, down-grading vs original spec or adding NON-OEM wheels could be asking for problems, or at least making yourself vulnerable...

Guess I'm back to talking to bmw leasing services directly and asking for clarification...

__________________
Current ride:
E70 X5 35D
Previous Rides:
E71 X6 50i
E60 550i
E46 M3 Cabriolet
E39 540i
E36 328i