Originally Posted By: artificialist
I always though operating temperature was determined by the car manufacturer and nobody else……."
well, if the engine isn'r ran long enough for the coolant thermostat to open, I kinda doubt that the engine operating temperature has been reached, by anyones standards.
I thought that was the thrust of this discussion, ie, how long does an engine have to be ran before the coolant or oil, or what have you, has reached the optimal level. It doesn't really mater what that number is, or "who" can legitimately determine that number. If the trip is so short that the coolant thermostat is not opening, then surely there can be some agreement that by any standard, the trip is too short for the engines benefit.
Z