I will change my pan and oil when the time comes. I did it with my 7 series and didnt regret it. I changed mine at 150,000 KM.
I couldnt believe the cost of the oil! I think I spent $175 on the oil alone. The guy at the dealership calls it "liquid gold"!! Its under lock and key at the dealership!
As for the filter, when I realized that BMW uses a paper filter, not a chain or other type, it leads me to believe that there is no way fluid and a paper filter can last the lifetime of the vehicle.... maybe the lifespan of when you actually own the car!.
Im only at 50,000 right now, but when I get there, if I still own the car, I will definitely change it.
2012 BMW M6 CONVERTIBLE