Just use clean fuel matched to the season. At most some IPA maybe required to absorb water due to condensation. There is a sub culture of operators that take it upon themselves to use #2 summer diesel in the winter by using elixirs, potions and voodoo. They are related to another group of oddities that feel the need to add miracle supplements to anywhere in a machine with a reservoir of sorts and a fill cap. They also tend to look for signs and symbols in the sky etc.