when i did my motor, i had drained everything except the heater core. i filled it with green Prestone "all makes, all models, all colors". That is suppossed to mix fine with the dexcool, yet not be as corrosive. i have zero problems with it. And when i did the electric water pump, i filled it back up with the prestone, it looked brand new(2k miles only though) and showed no sludge at all at that time.
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