Thanks Guys:
I got the Auto zone thermostat today. Its made by Wahler made in Germany, packed in Mexico Part # 910-180 on the back its stamped 80C. Tested few times before I put it in. It tests ok and opens at about 82C and closes at about 79C pretty nice. Tested a few times and each time within same value range. I will put it in one of these days when its a little less cold. I will then let you know how the car behaves after the replacement.
It cost me 14.99 + tax

MVk

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One penny saved is three penny earned.

1985 300D Turbo 179,000miles