Have you had your car back to your local dealer? Did they tell you that the noise was normal for this type of Mercedes? There is somewhat a high noise level with 4 cyl. M.B. engines in the C-class. If you start the car in a closed area (garage) the noise can be amplified.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH