Deviant Diesel
Sooting 1 jerk @ a time!
The fuel suppliers/distributors are the ones that add all the additives to all types of fuels. That's where the differences in Chevron's, Shell's, etc. fuel formulas all come in to play. Funny things is, my father-in-law used to drive a fuel truck and told me he would drop the same fuel at all the different stations, so who knows what goes into our vehicles. But your dyed/offroad diesel is done at the refinery.