How old is the car?
Your car will have a factory warranty for the first 3 years.
When that warranty expires, you will have the opportunity to extend the warranty with MB, and continue to do so each year.
You used to be able to take out extended warranty on an un-warrantied car but it involves the dealer running an extensive inspection on the vehicle first.
Not sure if they still operate this though.
Other option would be a 3rd party warranty company.
Depends how you feel about it all.
Usually, warranty is just good for peace of mind but can pay for itself in some circumstances.
Many advise just putting money by, to use in the event of your car needing work.