Stumbled upon these gems while going deep down the youtube rabbit hole. The first appears to be a British review of the BMW 635csi by Autobild TV. Great shots of the BMW grand tourer flying across the German countryside will make you appreciate the 6 series if you didn't already. The M1 connection doesn't hurt either.
And the next video is just so odd, it's awesome. Combine the music from the Never Ending Story and some state of the art '80's direction and you get this 1986 BMW promotional video. My favorite driving scenes might be the snow section. Enjoy.