OVP is the tall, rectangular one..should be aluminum body.
Pull it and see if it is the Modified relay 000-540-67-45.
If it is 000-540-52-45 , change it regardless.
That could be your start problem, and might have a running problem.
http://catalog.worldpac.com/mercedesshop/sophio/image.jsp?title=Overload%20Relay&url=http%3A//img.eautopartscatalog.com/live/P205670038APA.JPG