I know all the diesel guys around me use some sort of oil additive to the diesel. Off road is the same ulsd just dyed red. Ive been working on diesels for close to 20 years and always prime the fuel filters with atf. Its amazing how quiet the pumps injectors and motors run on pure atf. Ive had some new customers come back after i pm'd their truck saying it ran so much better after i worked on it. Told them what i do and now they add up to 1 gallon of atf or 2 cycle per 100 gallons of diesel. I see some of those truck on the regular and many have 1,000,000 or more on them. I was in a c15 cat the other day for head work and i must say it was one of the cleanest motors everywhere i looked. Ive seen gassers way more carboned up with 100k on them compared to this motor with 1,300,000. The extra oil way helps them out. Also anyone using a fuel filter with less then 10 micron media should switch them to 10 micron or larger during the winter or face problems gelling way more frequently.