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Do diesels have open/closed loops?
I run my block heater in the winter mostly because my batteries are failing and can't start a cold engine. My Cummins also takes 10 miles to come up to temperature, so this helps in that regard too.
The grid heaters frequently come on when the engine and intake air is cold, so plugging in helps in this regard too.
I wouldn't bother plugging in if it's above freezing.
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