Prestone Cooling System/Antifreeze Treatment what is supposed to be in this stuff?
On the back label it lists Contents as Polyalkylene Glycol (proprietary).
I am probably reading this wrong but isnâÂÂt that PAG oil?
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FrankD.
Is it not Propylene Glycol (PG)?
A phosphate inhibitor (phosphated HOAT) is often used to act as a buffer to keep the antifreeze (PG) mixture alkaline.
Probably just word play (proprietary); it is not PAG refrigerant oil.
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