Have you ever mixed the two? I accidentally poured regular coolant in my girl's sunfire when she popped a rad hose loose. It instantly overheated. I wasn't thinking about the fact it was GM when I poured the regular stuff in. Anyway, I've also poured a little of each into a container to see what would happen and they turned into a gel like substance. Trust me, you don't want to do this in your motor or rad.
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