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Haha, so far I've gotten two replies from the manufacturers. Both of them have claimed that block heaters don't boil coolant and it shouldn't effect coolant life. I've replied to both with a link to the install manual that specifically states that it does in fact boil the coolant and that I can hear it boiling when its been plugged in for any length of time.
One of them did mention that elevated temperatures will reduce coolant life. I asked for further clarification as how that manifests itself.
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