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50 50 Coolant Water

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A nice and easy way to make sure you have the proper 50/50 balance of coolant and water is to buy premixed coolant instead of trying to guess how much fluid your radiator takes and pouring in too much of one or the other. If you're replacing all the fluid in your cooling system and don't use 50/50 coolant, then use distilled water if you can. It does not have ions in it that will rust the interior of your radiator like tap water will.