Coolant test on a 5-year-old batch went sideways fast

Ran a full sump swap with that concentrated coolant that sat in my garage since 2019, ended up with foaming so bad it tripped the low-level probe twice on Tuesday. Turns out oxidation messes with the emulsifier way more than the label implies, even in sealed jugs. Anyone else gamble on old stock and get burned, or do you just eat the cost and order fresh?

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