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2012 Mercedes-Benz E-Class Luxury 3.5L 4dr Sedan RWD

2012 Mercedes-Benz E-Class
Trim Info:
Rear Wheel Drive, 4 Door Sedan, Midsize Cars
17 (2011) mpg city / 24 (2011) mpg hwy
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The best way to remove deposits is to have it done professionally by a qualified mechanic through a process known as "chemical decarbonization", where basic chemicals are carefully ingested by the engine that will help unseat and burn off this nasty crust. This procedure is relatively inexpensive and can be performed by any specialty shop

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Recommendation:

Take this vehicle to a garage and ask the mechanic to test the EGR valve. If the valve is indeed bad, have it replaced. Also, check the spark plugs for carbon deposits

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