What happens to an engine during a cold start in sub-zero temperatures?

Another issue is diesel itself. We don't have the kind of cold they get up further north, but it's banged on the -20F door here a few times, and a few days near -10F is not uncommon Diesl fuel gelling up or truckers coming into this part of the country from warmer areas with untreated or improper grade fuel Interestingly, none of the pumps I'm aware of at consumer stations offer a choice as to no1 or no2, and they "claim" the fuel is "treated." That claim doesn't do you much good when you get barely as far as Havre, MT LOL

At the big parts store I worked we used to sell Racor fuel filter systems. They also offered a fuel recirculation / heater setup