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    Changing coolant-water ratio of 50-50 premix?

    As so many of the available coolants come only as a 50-50 premix, is there any way to change the ratio upwards? (coolant-water) I have 2 scenarios in mind: (a) want to flush system with distilled water ... then use 50-50 premix to fill ... but that might leave me at something like 40-60 (b)...