I bought this car with 4000 miles on it from a dealer and it was certified and still under warranty. Very soon after bringing it home it developed a very loud rattle (more like a ticking sound) on the drivers side that sounds like it's coming from near where the windshield meets the dash. When it's happening, it's nearly constant and it sounds exactly like what the video shows. It is definitely louder in person than in the video. I can be on the smoothest of roads and it still happens. Nothing that I push on in the car makes any difference.

I finally took the car to a dealer to have it fixed and luckily they heard it as well. They have had my car for over 2 weeks now and now they have taken the dash apart. They still don't have any clue what the issue may be. The shop foreman is the one working on it. They have found a few minor build issues with clips and whatnot, but nothing they have fixed has made any difference.

The noise is so odd that I thought someone on this forum may have heard about something similar. Does anyone have any ideas on this?

My car ended up in the shop for a month. They took the dash completely apart and found several other things all around the area that they thought were causing this, but none of them worked.

They ended up contacted Mercedes in Germany and the solution was to stuff insulation behind the heat shield on the hood and the one shielding the cabin from the engine bay. This immediately fixed this very annoying problem. I wanted to post this in case anyone else has this problem. I have seen videos before, but never with a solution that worked.

Good happy ending I am sure now your enjoying the pure sound of your C63 engine which for some reason they stopped building it.