If you go to the MB specification sheets, 223.2 lists the approved oils for the various MB engines.
http://bevo.mercedes-benz.com/downloadf.php?filename=en/Spec_223_2.pdfLook at the next to the bottom line of the first page, "VAN engines (Vito, Sprinter): OM 642, OM 646, OM 651" (you have a OM 642 engine, look at the sticker on the valve cover) There are four different approved oil specifications for this engine,
228.51, 229.31, 229.51, 229.52According to this Shell Rotella T6 Spec sheet, it DOES NOT have MB approval for any of the above specificatons.
https://rotella.shell.com/products/t6-full-synthetic/_jcr_content/par/textimage_1335213348.stream/1388525673850/2c4570ceb0dcc96c0e045d7d6f3c7796f77a84ed6a3d6752bb50d245468c48b2/rotella-t6-brochure.pdfEdit: the following statement is INCORRECT for a 2007 and up Sprinter chassis.
Easiest and cheapest oil to use is Mobil 1 European Car oil 0-40wt from Wal-Mart for about $25 or less a jug.For the OP the following would be suitable oils to use.
For the OP's engine an oil commonly used by the View and Navion owners on the View/Navion forum on Yahoo is the Mobil 1 ESP Formula M 5w-40 (which I think is now out of production) or the Mobil 1 ESP 5W-30. Another oil that many use as it frequently is on sale at NAPA is Valvoline SynPower MST 5w-40
https://www.napaonline.com/en/p/VAR966
It is $9.69 regular price per quart, but frequently is on sale for a price in the $7 something range.
If you really want to save some money on it, buy a 24 qt case for $6.25 a qt.
https://www.napaonline.com/en/p/VAR861430Here is the listing for the MB APPROVED oils for each of the above specs. Note that many of these oils are available only elsewhere and not in the US.
http://bevo.mercedes-benz.com/bevolistenmain.php?navigation_path=bevolisten&blatt=228.51&content_action=showhttp://bevo.mercedes-benz.com/bevolistenmain.php?navigation_path=bevolisten&blatt=229.31&content_action=showhttp://bevo.mercedes-benz.com/bevolistenmain.php?navigation_path=bevolisten&blatt=229.51&content_action=showhttp://bevo.mercedes-benz.com/bevolistenmain.php?navigation_path=bevolisten&blatt=229.52&content_action=showIf you are interested in finding the approved lists for all MB specs for oils, fluids, antifreeze, etc, here is the master list.
http://bevo.mercedes-benz.com/bevolistenmain.php?language_id=1Here is your owners manual, which lists the first three specs, the fourth was created after your vehicle was built, and is included in the current, up to date list that MB publishes. See PDF page 364.
Edit: sorry, had wrong year owners manual, here is the 2007 manual. No running page numbers so you have to go by the PDF page nos.
http://www.sprintermanual.com/wp-content/uploads/2011/12/2007_Sprinter_Owners_Manual.pdfCharles