Re: antifreeze?
The only concern I have had regarding shelf life is silicate drop out, I have seen chunks of silicate settle to the bottom of plastic containers, if in a cooling system I use a volt meter to test for acidity normally caused over a period of time by dissimilar metals in the cooling system. I always try and use low silicate antifreeze such as peek , we had problems with waterpump seals failing in our diesel engines and the Engine manufacture attributed it to silicate drop out. if left untested/untreated for months there are risks of galvanic action caused by dissimilar metals .
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