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ive never once heard of that drain plug breaking.
but use the plug to drain it when the vehicle is warm ( prefered doesn't have to be but thats a me thing ) I also recommend once all the coolant is out to take the lower rad hose off and allow whatever is left to drain out.
coolant should be changed every 5 years not because of the color but because of the strenght and the chemicals in it that over time can destroy your cooling system
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