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I completely agree. But, with new, quality anti freeze you may want to wait on additives unless you have a known issue. Excessive (I doubt a bit of additive qualifies... ) dissolved solids also not great.... 'just saying- good luck.

Any auto parts store will carry "additive" , including water wetter. The dosage is on the package. Try to use as close to distilled water as possible at changeout . The Anti-freeze part in antifreeze can and will last forever. The additives are to control pH (acids formed are bad), and lube...