See also:

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

Correct driver's seat position
Observe the safety guidelines on seat adjustment. - Check whether you have adjusted seat 3 properly. Electrical seat adjustment When adjusting the seat, make sure:     - you ...

Qualified specialist workshop
An authorized Mercedes-Benz Center is a qualified specialist workshop. It has the necessary specialist knowledge, tools and qualifications to correctly carry out the work required on your vehicle. ...