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Compatibility in antifreeze/coolant 900 1991

posted by  Sarki on  Mon Nov 1 11:15 CST 2010
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last visit: Wed May 7 05:39 CST 2014
[RELATED]

Just finishing up on radiator, upper/lower hose, thermostat replacement. Radiator was leaking from several areas as the core was rotted.
My question: I have (2) 1.5 litre containers of blue Pentofrost NF Lifetime coolant. The car was previously filled with regular green Prestone Antifreeze. The only coolant removed from the car is what was in the radiator. The Prestone coolant that I drained had only been in the car about 3K miles.
Can I just add the blue Pentofrost to what remains in the car after I complete my radiator install or do I need to drain all the remaining Prestone.
Bottom line, are they compatible??






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