I use Amsoil front to back in my Beemer. No slam there against Mobil 1, however, since I used that in my race cars for a loooooooooong time, and nver any issues.
I use the Amsoil because I got on their "Preferred Customer" program where for a small annual fee you can buy all their products and have them shipped directly to you. I have now used Amsoil's products - from oil to gear lube, from vinyl/leather cleaners and protectants, from multi-purpose spray lubes to greases, etc. - for quite some time now in all my personal vehicles, and I haven't found anything that wasn't first-rate stuff. Interestingly enough, the BMW dealership where I prefer to do business with (up in Austin, nearly 200 miles away...) also uses and recommends Amsoil highly.
For me it's nice to work up a fairly large order a couple of times a year and stock up my garage with everything I need for my cars, bikes, lawn care equipment, etc., and then I have it right there when I need it.
And I'm an automobile dealer...
You can check out all their products, as well as the "Preferred Customer" program at:
http://www.amsoil.com/
Hope this helps!
Dallara