You can download BMW 3 Series from here : https://play.google.com/store/apps/details?id=lamborghini.wallpapers.CarWallpapers.CarSounds There are thousands BMW wallpapers and it is the best android BMW wallpaper source.
Some popular BMW wallpaper categories in the app like
BMW M2 wallpapers
BMW M6 wallpapers
BMW X4 wallpapers
BMW Z4 wallpapers
Car Wallpapers 