While in eastern Massachusetts we enjoyed 70 deg. F weather, I did one of the items on my Mercedes to do list ....I took out the Wahler (auto zone) which is marked 80 deg.C, and keeps the coolant temp. at a steady 81-82 degrees, according to the dash gauge. I changed to the Behr, which is also marked 80 deg. C, and did this to "winterize" the car (oddly on a 70 F day in January!), because this thermostat keeps the coolant temp. at a nice toasty 93 to 95 degrees C (better for heat in the cabin)!

I just thought I'd mention it....probably covered in other posts. In case you think your car runs too hot, change the thermostat to a Wahler. If you have a wahler, and want better winter heat, change to a behr.

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)