Mobil1 0W40 has been often recommended on here (and I am using it in my E90 N52 currently ) However, I came across the following link elsewhere on this forum. The results for M1 0W40 don't look so good.
http://www.animegame.com/cars/Oil%20Tests.pdf
Sharing on this sticky since it seemed relevant to this discussion.
Please use this as another data point to make an informed choice on what's best for your car (I am not making a recommendation for/against M1.)