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Old 09-25-2013, 10:11 AM   #10 (permalink)
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Originally Posted by jeff88 View Post
Any reason why I couldn't use propylene glycol instead of EG? It doesn't have as low of a freezing point, but I don't really have to worry about that in this weather! Is there another reason why I wouldn't want to use it?
Cost is the only reason I've found, some people do use it.


Also as a side note, why do we not use oil as a coolant? (I know that the engine oil does help with cooling, but I'm not talking about that). Couldn't one use a really thin, maybe 0w-10, oil in a coolant loop? I would think (and read) oil is a better vehicle for heat pick-up and removal.
Again, cost, it would cost you $52 per gallon, oil also it gets thicker when you cool it so you'd need larger passages in the radiator so you'd need more of it and thus more cost and weight, air cooled VW's had oil coolers on them, some motorcycles do as well, but in general they all run much hotter and their cooling is not as even.
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