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Usually you would let it warm up to 160 degrees f, and if run hard let the turbos cool down for at least 1 minute.

My truck has a Cummins ISX in it. I warm the engine up by dumping the air out of the tanks before starting the engine, and letting it build pressure by idling. When the air is up to 110psi or so, it's ready.

In shutdown, if you come off the interstate and pull into a truck stop, by the time you get to where you want to stop the truck, the turbo is spooled down. If I had something like a Cat 3406 or a Cummins Big Cam--an old tech engine--in my truck I'd idle for five minutes, but the ISX is designed to be shut down quickly.

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