I used to live in Albany NY. I experienced gelling once in my old Dodge CTD. It was -27 that morning. Obviously, I had the block heater plugged in all night. Truck started right up. On city streets it seemed OK. Got on I-90 Thruway and top speed was 53MPH! Blue and white smoking, thinking I was ruining a perfectly good engine, BUT too cold to stop! Got to work downtown, again 30 mph no obvious problems. Parked, walked the 3 blocks in pain, so cold that walking fast created wind chill! Came out of work in a +7 degree heat wave. Truck was back to old self! 80MPH on ice covered interstate! Kidding the pavement was mainly dry and white from the salt.

At that time, I was in a diesel users group. It included NYDOT, bus garages, school districts, oil suppliers, Cummins, Detroit. etc. As the telephone company member (stationary diesel powered gen-sets) I had to ask about storage of fuel in the long term. We talked about the critters and slime that forms between the fuel and the water and instability and other important issues.

When we had the discussion about pour point, cloud point and gelling the standard was the addition of an additive or cutting #2 with a percentage of water white #1 kerosene aka "winterized diesel". The rep from the NYDOT whose plows take care of the Adirondack Mountain roads admitted using 70% kero at times during the coldest months. We were, with mouths hanging open, amazed. "How do the engines (injectors) live with the lack of lubricity?" His response was the lives of his plow drivers were more important! "Where we plow, if the engine stops the driver dies!" Uh, oh, yeah! Good, uh, point.

 

It was in the 20's when I filled the tank up. I always put the additive in after I've driven to the gas station but before I fill the tank. One of the other members on here said his DK treated fuell gelled around 0 too. I've been meaning to try some other additives and now I might (if I could only remember what company it was )