[boouch]

Hello,

I purchased a 2020 C63s and I have about 4k miles. I have recently noticed this howling noise and I think it is coming from the turbos. It seems to happen near 3800-4000 rpm when i downshift or when I rev the engine. I have taken it to the dealership and they are saying it seems normal but i took it to a mechanic shop and they are saying there may be a problem with the turbo. Let me know what you think I should do.

 

[boouch]

Any ideas?

 

[mattml430]

Any ideas?

Pull the serpentine belt off and do the same just for a few seconds. It will eliminate all the engine accessories and idler pulleys.

 

[Joacoaven]

I have the same car and it does the same sound I think its Mercedes that did it on purpose...