Originally Posted by Stealth Mode
stock thermostat in the cummins is a 190*. He said what happened, I just thought he never realized it ran at 200* warmed up.
i get uncomfortable with any of my motors running above 180*. But the cummins lose mpg with the lower thermostats because of being temp controlled from the factory with the ecm.
On a '06 truck thats banging miles. Gotta love the durability of a 360ci straight 6.
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Be glad you never had a rotary engine car. Those things run 215-220 normally. 200 is a very average temp for a car, mine sits a 204-206 when idling or running. It drops down to about 200 even when at speed. If an engine gets too cold after warming up, it can actually trip a code and the engine will go into an open fuel loop mode, which it does to try and warm it back up. It's the same mode your car is in from a cold start, and it wastes a lot of gas.