You can buy 5w-40 Mobil 1 at the MB dealer or in some places Wal-Mart if you want to provide it or do it yourself. You won't have problems with 10W40 M1. I buy my M1 at Wal-Mart and use it in 2 late model cars and have for many miles with no ill effects. I only use MB oil filters too by the way.
Oh, I live in Texas near Fort Worth so low temperatures almost don;t exist here. If my garage gets down to 45 degrees then it is really cold outside.

Best Regards,
Wayne Hyde