we just mix kerosene in the fuel when it gets that cold. i never plug my truck in unless they are calling for anything colder then -20 or a wicked storm, just in case we have to bug out, i know the oil will at lest be warm i love the grid heater in the cummins. cycle it a couple times and it'll start no problem.



the only time my truck didn't start in the winter was because my second battery froze.