Re: Why
It's not a problem until it boils over. Heat isn't to much of a problem, but boiling is. Bubbles start forming around the cylinder walls and act as an insulator and drives the heat up even more. Sorta like a runaway situation and it is not good on the engine. So, as long as it's not boiling it should be fine. How are you determining the temp level? Heat gun, separate high quality temperature gauge?
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