Glow plugs are supposed to aid in the ignition and combustion process (In diesel engines). Faulty glow plugs can adversely affect engine operation. So, if you're recognizing one of the above signs of glow plug failure in your Mercedes-Benz, call your mechanic immediately.
9. Listed below are a few reasons
why glow plug prematurely fails
in a car:-
Exposure to engine temperature
Carbon buildup
Voltage surge
Defective valves and pistons
Overage