just use this mobil one....

5W-40, first choice....

http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Turbo_Diesel_Truck_5W-40.aspx

15W-50, second choice

http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_15W-50_.aspx


The 0-40 version, is what "Mercedes" recommends (what you will probably be told to use if you visit a Mercedes dealer.

...... my personal opinion, is dont' use that one in your diesel....
Use 0-40 in your late model Euro Gasser.