Hello List

So should I change my coolant fluid before storing it through the winter? :
With Distilled OR Tab OR Drinking (bottle) water50%/50% MB coolant? Now on Destilled 50%/50% MB coolant
Thank You. Tomorrow is the last day I can do this. What is the best way of doing it with thermostat in?

Christian
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cK
1972 280SE 4.5L