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I know it was mentioned that when the coolant becomes old and expires it becomes corrosive and can then cause electralysis within the metals, but the proper coolant ph is 8.5-10. Anything lower of course is acidic and bad. They do however make a coolant ph buffer if the coolant is not within the proper range.(pretty common even with new coolant to not be within range) This can be added to the cooling system to help raise the ph.
Zack.
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