Koslov: yes, with a corrosion inhibitor, you should be ok, but you'll have to keep an eye on it, and flush the coolant ragularly (1/3/6 months???). If you look at the chart (in my first post) you'll notice that Stainless 316 is pretty far from chrome (passive). In other words, water by itself will create a highly corrosive environment. If the materials touch each other (aka solder) but not through water, there won't be any corrosion, except from the ambient moisture.
Like airspirit said, use WW in the prescribed "1 oz per gallon" dilution ratio.
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