If you plan on keeping them after warranty, don't buy one.
I ran about 400 of 3.0L diesel Sprinter cab and chassis DRW in our fleet. The engines were reliable out to 75,000 miles. Expensive issues after that were upper intake butterfly valve failure, about $4000 fix. Cat down pipe cracked, had to replace everything from manifolds to muffler including the cat, at least $3000. Only lost one engine to a wind blown roll over, hydro-locked it. About $20,000 for a replacement. Highest mileage ones were at about 150,000 miles.
They got to be so unreliable, our drivers would rather take a clapped out 2007 E350 vs a 2013 Sprinter. Check engine lights, no starts, just not a good experience.
If you used OE filters, and correct spec oil, 229.52, which I recommend, an oil change is at least $300, closer to $500. Newer Sprinters allow a 16,000 mile or 1 year change interval.
Check engine light means a trip to the MB dealer ($$$) as independents won't spend the $10,000 annual fee for the diag license and equipment.
Rust on the 2009s to 2012s was horrid, not sure how the newer ones are doing.