Miles between oil changes has always been 15,000 in Europe. It was set at 10,000 in the U.S. because Dodge wanted to get people in more often to sell them more services. MB went along with it because they were worried that some might not use the right oil. No problem now that Dodge is no longer involved.
You might want to have the dealer do it until the warranty is off - or if you do it yourself, meticulously document it in case you need repairs.
It is very easy to change the oil and the advantage, in addition to saving money, is that you can guarantee the correct oil is used - extremely important.
To change the oil: you need the correct socket and torque wrench for the cap on top the oil filter, a new filter, enough of the correct oil, and a pump like is used for boat oil changes. Warm the engine, pump out the old oil thru the dipstick, unscrew the cap on the filter and replace the element, then replace the amount you removed with the new. Run the engine a while and recheck the oil. Also, always recheck after driving a little to make sure you didn't screw anything up.
According to one of the engineers who developed the NCV-3 version, it was designed to have the oil changed from the top. It can be done wearing white glove once you've had a practice run. All of above from the Sprinter Forum - highly recommended if you have a Sprinter based MH.