Hello!

So I found auto volume too high as standard. So, it increases radio/music etc volume with speed but it makes it play way too loud when doing highway speeds. I need to turn volume down when on highway and up again when slowing in town. I did not found any settings regarding this (like in Audi for example).

I'm on 4D sound system.

I will report it to Mercedes next time.

Are you talking about the loudness normalization settings? If so, go to settings, system, then audio, you should find a few modes of adjustment for it.

Will check that thanks!

OK I checked that setting and I have it on "Off". But I don't think it is for speed releated volume increase. Its more like normlization for all sources of audio - so when you have some source that have low volume output - it will bump it so it will match your radio or other sources volume.