Just a comment
Since the vehicle is under warranty its advisable to take it back to the dealer chain for investigation. This is especially so since you paid a warranty tariff for at point of purchase to cover such repair/fault contingencies .
So why not let them try to figure it out at dealer MB warranty support cost?
Now MB and dealers (any brand dealer ) have ASI's and service info not available to the public at large, including you, and that is sometimes mentioned in service bulletins and upgrades only available by subscription.
Now two similar occurrences we dealt with this week.
One specimen, an oil leak at 52,000 miles on an OM 642 and it was located as a small leak at the turbo pedestal to block joint on the driver's side . This was creating a drip which burnt off onto the exhaust manifold on the driver's side . Only observed by a mirror and endoscope & by removing the turbo heat shield removed could it be visually located . The improvement only came light when we ordered a new gaskets etc.
The new gasket has been upgraded obviously to improve oil sealing properties.
Leaves me to speculate how many others are similarly affected?
Similarly we had one which emitted fumes at a stop light /intersection. That was traced to a L/H rail overflow port hose.
And then the usual expensive rip out, a partially leaking oil cooler last week. Not enough to flood the valley but just enough to drain out through the block drain ports and exit underneath leaving a drip or two and fumes.
Dennis .