Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - AntiFreeze tester, propylene vs. ethylene difference
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Old 07-08-2009, 10:03 PM   #2
iminhell
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Chances are you've been using Ethylene Glycol the whole time being it's the more common type.
Prestone Low-Tox is the only antifreeze they make that is Polypropylene Glycol. All the others are Ethylene.

I'd blame the tester on being old?
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