Constantly whining




I think the noise you talk about is tire noise. This car is very dissapointing in two qualities. One is intgernal rattles and the other is road/tire noise.
The "metallic" nature you mention is probably noise from the springs/shocks mounted without sufficient dampening between them and the car body.
I have had similar cars with Continental and Pirelli P-zero tires and they are equally as bad.




However, it is tire noise that I hear because it disappears on smooth roads.
Also, Michellin tires are much nosier than some other brands. They are known to be hard riding and noisy, but then get better wear and gas mileage (maybe). On other vehicles I have replaced Michellins with other brands and cars rode better and were quieter.
BTW, the only rattles I hear are when I open the sunroof after car has set in hot sun for a while.
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If the noise continues (after the new tires wear down sufficiently) I will contact Mercedes directly.




