2009 Mercedes-Benz E550 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz E550
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2009 Mercedes-Benz E550 ProblemsOil Seepage on Back of the Cylinder Heads
The Mercedes Benz E550 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.
Vehicles equipped with a 7-speed automatic transmission may develop a rough shifting condition, most commonly going up from first to second gear and going down from third to second or second to first gear. Our technicians tell us this is due to an internal component failure. Mercedes has released updated parts; the transmission will need to be removed and disassembled to complete the necessary repairs.
Irregular and premature tire wear can be caused by the front thrust link bushings cracking and causing excessive movement in the suspension. The thrust link bushings are fluid-filled (to help reduce vibration), so if they crack, they will leak oil.
2009 Mercedes-Benz E550 QuestionsMy 2009 E550 has a shifting problem.At normal accelerationit seems to confused (2 answers)
confused about which gear to shift or a miss . Mercedes says nothing wrong dont show up on computer.