I don't mean to cause alarm. Maybe it is normal. My temp gauge is pretty much stagnant in the winter and hyperactive within a range in the summer. I thought all MBs were like this.

Are you saying that thermostat's been in there for at least 14 years?

Owning an 86-87 603 is reason enough to be a high temp freak

Sixto
95 S420
91 300SE
87 300SDL
83 300SD