See also:

Additives
Do not use any additives in the engine oil. This could damage the engine. ...

Please bear the following in mind
At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" ...

Maximum permissible tire pressure
Maximum permissible tire pressure for one tire. ...