I get my diesel at the cenex station that already has winter additives in the fuel when the cold gets here and so far with my diesel pickups I have had no issues in the winter down to -35/40, my new tractor has a block heater and it will be parked in a un heated garage hooked up to a trickle charger that is it, this is my first diesel tractor so I will see how it starts below zero this winter.
So far we have had a few mid 40* mornings and the only thing I have done so far is to hold the glow plugs on for 10-15 seconds then turn it over, it chugs a bit then smooths out and I let it idle for 10 min or so and I also operate the FEL a little and 3 point, right now it is sitting in a open shelter at my other property so if it gets to cold I am wondering if it will start at all if we get a really bad cold snap before I get it to my home for the winter.