Re: Coolant additives
If I run antifreeze, my temp gauge reads about ten degrees hotter than if I use tap water. I don't know the exact numbers because I bought my temp gauge at Tractor Supply and it only has markings for 130, 190, 250 and 280 degrees, but it was cheap and doesn't require any current. I put the probe in the upper radiator hose and am very pleased with it.
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