I bought this car new in 2011. After a couple of months, started noticing a rotten egg odor coming from my car. The smell seems to come from underneath the car. Usually occurs when I'm going 45mph or more going up a hill on a highway. Took it to the dealer to check, so they took the car for a test drive and said they found no odors which I don't understand why? They said it might be the type of fuel I use for the car may affect it, but I use premium gas only from chevron. Mercedes really need to look into this, because the smell is horrible! I've been dealing with this smell for almost three yrs. Now.
2011 Mercedes-Benz C300 engine complaints
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