There are 2 owner-reported powertrain & transmission complaints for the 2010 Mercedes-Benz GL-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TRANSMISSION VALVE BODY HAS FAILED. TRANSMISSION HAS PROBLEM SHIFTING UP/DOWN AT LOWER SPEEDS (UNDER 40MPH). SHOW CONFIRMED THE VALVE BODY IS NO GOOD.
AFTER A LONG TRIP WITH THE 2010 MERCEDES GL350 BLUETEC, I NOTICED FRESH OIL ON THE GARAGE FLOOR. I TOOK THE GL350 TO A LOCAL MECHANIC FOR AN OIL CHANGE THE DAY AFTER, AND THE MECHANIC NOTED THAT THERE IS SIGNIFICANT OIL UNDER THE ENGINE. FEW DAYS AFTER, CHECK ENGINE LIGHT CAME ON, AND I TOOK THE GL350 IN FOR A CHECK, AND ANOTHER MECHANIC CONFIRMED THAT THE ENGINE OIL COOLER SEAL IS BROKEN CAUSING THE OIL LEAK. IT SEEMS THAT THIS IS A VERY COMMON FAULT WITH MERCEDES OM642 ENGINE IN MY GL350.
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