This reference discusses the thermostat a little.
http://www.motor-talk.de/forum/aktion/Attachment.html?attachmentId=725143

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

Thanks, that is the instructions I got with the product.

Given the "high performance coolant" is actually ethylene glycol, I'm rethinking this entire thing and wondering if it's worth all the hassle at all.

Some here had mentioned using it before, and I was hoping they would weigh in.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Per the instructions posted, Evans makes 3 kinds

Undiluted Evans Waterless Coolants:
High Performance Coolant
Powersports Coolant
NPG

NPG is the only one that is propylene glycol based.
For all Evan's waterless coolants, if you run low or leak some out you are screwed (unless you carry spares) because you can't add water.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked