Please note that your model listings do not contain S350 so I have had to list as an S500 to submit. Mercedes have looked at the car and could find nothing. They suggested it might be engine mounts. The noise and vibration goes once the car warms up. It's a W220 chassis, last Australian delivery of the pre 2005 model and has done 40000 kilometres.
I have a 2005 S350 that has engine noise and vibration when cold. on 2005 Mercedes-Benz S500
They built the car , how come they dont no, thats scary..