Get a good quality one like a Behr or a Wahler. They should come with new gasket.

The manuals always tell you to first test it in boiling water to make sure it works, but I have never done this.

Get a benz parts catalog from ************************. Their exploded parts pictures come in handy. Of course, support this site by buying from Fastlane.

On my car, the thermostst housing is secured with three bolts (only 10Nm torque).

Note orientation of old thermostst, ball valve should be situated at highest point when installed.

glenmore
1991 300CE
2000 C280
1990 LS400