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Message: [QUOTE="old#48, post: 372019, member: 32272"] Jaybird, [B]I think it would be great to use propylene glycol IF it's because of the environmental issues and being much safer for pets, kids etc.[/B] In my opinion, though, it doesn't have the heat transfer qualities of ethylene glycol, but that doesn't bug me all that much either. What bother's me is that, in my opinion, IF EngineIce is basically 50/50 propylene glycol in dionized water, then there are some questions here that need to be considered because of propylene glycol's heat transfer performance vs. ethylene glycol. Whoever wants to use propylene glycol because of the good safety things about it, then great, but I suggest buying it at the store, like that Sierra brand or something. I'm glad you brought that up, because [B]the environmental and safety issues are great reasons to use propylene glycol instead of ethylene glycol.[/B] [/QUOTE]