The only time I would consider using an additive would be cold weather. Cold enough where gelling could occur.
I'm not really sure of the gel point of diesel but if it's 0F or colder it's a good idea to run #1 fuel. If you have a tank full of #2 it probably wouldn't hurt to dump in some anti-gel additive.
Our issue is mainly tractors that still have #2 in the tank and winter sets in. They will gel up up when it's cold. Of course straight #1 is the safest bet but the additives do seem to help with #2.
I've already started filling them with additives and #1 fuel.
Howes was sale so I bought that. This is another brand we use.
https://petroleumservicecompany.com...supplement-cetane-boost-6-80-ounce-case/
