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Some people seem to think you should use ONLY Volvo coolant.
Others will say Prestone's "mix with any color" is OK.
I changed my radiator and heater core last October (98 S70 170K). The PO had used the Prestone coolant. I also used the Prestone to fill the system after I was done.
I am now beginning to catch a whiff of coolant in the AC every once in a while as if there is another core leak. I am not a chemist or an engineer, but it does make me wonder if the coolant has anything to do with it. I am tempted to spend the extra money on the Volvo coolant in the future - just in case.
My daughter will be using this car also when she gets her license.
Good luck,
Calvin
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