Quote:
Originally Posted by jlspr
It boils over into the overflow then evaporates. It uses a little coolant every day.
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That isn't a head gasket leak, that is a result of your engine already running too hot since the thermostat is stuck shut.
Your risk of blowing the head gasket is many times greater with your current problem than by running a 190 degree thermostat.
I'm no expert on the subject, but I can't see any reason why a 190 degree thermostat would appreciably affect gasket deterioration. There is practically no added pressure since it isn't a boiling temperature. Perhaps the material is slightly weakened by the extra heat, but it should be built to withstand much higher temps.