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I have never used those products, I have always just filled with distilled water and run a couple of hot then cool down cycles, then drain. Usually good enough to remove all of the last coolant and any unwanted deposits. If you use one of these I would still flush with distilled water to get rid of any leftover chemical. Make sure you set your heat control on high while you are flushing, draining and filling so that you get the heater core too.

I have not had an issue filling and burping as long as the thermostat has a jiggle valve in the 12 oclock position.

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