Don't use MB229.1 oil (e.g Castrol Magnatec etc). The handbook specifies at least MB229.3, as this car is designed for extended service intervals. Make sure that it is fully synthetic.
It is probably hard to beat Mobil 1.
+1, allthough Mobil Delvac 1 (228.5) is marginally better, and usually cheaper if you can get it. (Being a diesel specific oil means it has a more agressive additive package than M1)It is probably hard to beat Mobil 1.
As far as I know Magnatec does not meet 229.1.
229.1 is an early fully synthetic grade