2012 Mercedes-Benz E550 4MATIC Problems
RepairPal has identified the most common problems with the 2012 Mercedes-Benz E550 4MATIC based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.
The Mercedes Benz E550 4Matic may have engine oil seeping or leaking from the back of the cylinder heads. This is commonly misdiagnosed as leaking valve covers.
On the back of the cylinder heads there are three, in total, plastic expansion plugs that plug access ports to the camshafts. These plugs are well known for seeping oil, and leaking if left unattended. The oil will run down the back of the engine and eventually make it to the ground.
Replacement of these three plastic plugs is extremely simple, and should be done as regular maintenance. The recommended interval for replacement is every 60,000 miles.
High mileage or older vehicles commonly develop leaks from the differential seals and/or cover. Our technicians recommend a complete reseal of the differential unit whenever these leaks are repaired.