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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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