You may also want to check that oil, I don't have time right now to research it thoroughly but from the Valvoline web site you may want to look into their MST oil for the Mercedes diesel with dpf.
You will also need a filter wrench (the ones that plug into a rachet work fine) which are also available online. Make sure your oil meets spec 51 as well. Lots of posts on proper oil on this forum. Good luck.
Thanks all. The Valvoline mentioned above meets the specs and was on sale until the end of April at Advance Auto parts for $5.49 a quart. The whole job with filter will cost me around $100.