Some usefull information on the thermostats and radiator cap for the Mitsubishi Montero Sport 3.0L V6. These are the factory specifications and presume you are using or testing a factory part. I know for a fact that some after-market thermostats and radiator caps vary significantly. If you're unsure what your thermostat or radiator cap is doing a good quality - accurate - infrared thermometer and/or radiator and cap pressure tester can be invaluable.