My thermostat is stuck open and I am planning to R&R the thermostat as well as get rid of the green AutoZone coolant which appears to be in my ride right now.

I have most of a gallon of VW G12 coolant (my TDI leaked coolant) that I would like to get rid of. Can I use the G12 in the 617 safely or should I spend the $20 to get some Mercedes coolant? Is filling it back up with more Peak or whatever the green stuff is ok, too? It seems to do an OK job but temps haven't gotten above 90F here yet - with the thermostat stuck open the highest I've seen the temp gauge get is 80C.

BTW, I do plan to drill holes in the new thermostat when I install it. Does anybody here use Redline water wetter? I'm not sure how compatible that stuff would be with G12 or Mercedes coolant.

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1984 300D 193.5k miles
ASTM-certified B100 bio when able