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also dexcool when mixed with tap water, green coolant(older) and plain ole air, begins to cause corrosion issues inside the motors, especially begining with freeze out plugs and water pumps. My 95 STS started springing leaks in several freeze out plugs due to this issue. When i had my SS motor out, everything was flushed and filled with Preston "Any make/any color" antifreeze(its green btw). Just remember to get all your dexcool out, rad heater core and all hoses. I flushed my stuff several times with a hose till i felt it was all gone.
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