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.
https://www.youtube.com/watch?v=lD2k4S5S2sg
https://www.youtube.com/watch?v=lD2k4S5S2sg
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