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I have had a diesel truck here in Wisconsin for the last 10+ years with no problems from fuel gelling. With the advent of the new ultra low sulfur fuels our fire department mechanics have been using an additive in every rig, every tank all year long. They state the new fuel starts gelling under 32 degrees. These are rigs that start out in a heated garage all year long. The additives the oil companies add should keep the fuel from gelling however,they use them for all the advantages. More cetane, more lubrication, less smoking, helps keep the injectors clean, helps eliminate algae and water problems, as well as it's anti-gelling capabilities. I sound like a commercial. On their advise I have been adding it every tank for the past year in my two diesel vehicles. I don't know if it helps but it is cheap insurance for all the unknowns with todays fuels.
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