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The crankcase vent valve on a 2015 Mercedes C300 is located at the bottom front of the engine on the passenger side. It is screwed into the block in the crankcase area to allow gases from the crankcase to flow back into the engine intake and be safely burned during combustion. A malfunctioning valve can cause issues like engine running poorly, stuttering, or stalling while driving, indicating the need for replacement.
The crankcase ventilation valve on a 2015 Mercedes-Benz C300 can be found at the front bottom right side of the engine near the passenger area.