There are 9 owner-reported engine complaints for the 2015 Mercedes-Benz ML-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Cam Shaft replacement diagnosed after week and half visit to Mercedes Benz dealership for engine rattling at cold start up. We are left with a $10,000 repair after performing all scheduled maintenance at the Mercedes Benz dealership since owning in 2015.
precense of some liquik oil from up motor litle meiby ist because change oil because i buy recently , i need observed ,ore time today i clean this area.
The cam shaft adjuster failed, causing a loss of power in the engine. Vehicle could not maintain speed on hills or merge onto interstates in this condition.
Engine stalled multiple times even though it has been serviced multiple times at multiple dealers.
I took my car in for a different repair and they found this issue as well. "Diagnostic - Oil leak (Visual): front covers leaking oil down front of engine." The leak was due to a crack in the sealing cap. My car 2015 Mercedes ML350 4Matic is in the recall for 2018070015 but my VIN number was not included in the recall although I am having the exact issues the recall covers. Recall 2018070015 "correct oil level as necessary and replace the reservoir sealing cap to prevent oil foam from leaking out."
The contact owns a 2015 Mercedes-Benz ML350. The contact stated while driving at an undisclosed speed, the engine seized without warning. The vehicle was towed to the local dealer where it was diagnosed there was a possible mechanical break down due to engine sludge, ignition varnish rust, corrosion, dust, cracked rubber, dry rot, road chemicals, alterations or improper oil, coolant, fuel, or lubricants. The vehicle was not repaired. The manufacturer was not contacted. The approximate failure mileage was 70,273. The contact stated that they did not submit this complaint and the vehicle actually belongs to another individual.
TL* THE CONTACT OWNS A 2015 MERCEDES-BENZ ML250. THE CONTACT STATED THAT THE ENGINE DEVELOPED A DIESEL FUEL LEAK OVER THE MOTOR, WHICH RAN ACROSS THE ENGINE. THE MOTOR WAS SOAKED WITH DIESEL FUEL. ALSO, WHILE DRIVING, THERE WAS AN ODOR OF FUEL INSIDE THE VEHICLE. THE CONTACT DROVE HOME AND CALLED VALLEY IMPORT (402 40TH ST S, FARGO, ND 58103, (888) 929-9843) TO SCHEDULE AN APPOINTMENT. THE VEHICLE WAS TAKEN TO THE DEALER WHERE THE TECHNICIAN FOUND DIESEL FUEL ALL OVER THE ENGINE AND THE PAN UNDER THE ENGINE WAS FILLED WITH FUEL. THE CONTACT STATED THAT THE FUEL SOAKED UP ONE OF THE ENGINE MOUNTS. THE VEHICLE WAS IN THE PROCESS OF BEING REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 30,000.
AT ABOUT 50,000 MILES, NOTICED ENGINE LEAKING OIL EHILR CAR WAS STATIONARY. DIAGNOSED AT DEALERSHIP AS " OIL SEAL" AND REPAIRED. ONLY TO LEAK AGAIN 2 MONTHS LATER. REPLACED AGAIN AT DEALERSHIP. WAS TOLD ITS NOT NORMAL BUT IT CAN HAPPEN.
VEHICLE PURCHASED NEW 16K MILES ON IT NOW ALL WORK DONE AT DEALER, SHUTS OFF RANDOMLY WITH NO WARNING AT STOP IDLE OR HIGHWAY DRIVING. EXTREMELY DANGEROUS I HAVE TAKEN IT TO THE DEALER 4 TIMES FOR THE SAME ISSUE. THE DEALER HAS UPDATED SOFTWARE THEY SAID SHOULD RESOLVE PROBLEM. THIS INTERMITTENT PROBLEM HAS OCCURRED AGAIN AND NO CODES FOUND BY THE DEALER. MERCEDES BENZ USA ATTEMPTING TO FIND RESOLUTION BUT WON'T SEND OUT AN ENGINEER SINCE DEALER CAN'T REPLICATE THE PROBLEM. VERY DANGEROUS SITUATION FOR ME AND MY FAMILY AND OTHERS ON THE ROAD........
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026