Other than turning your fuel filter red, I haven't heard that the dye does anything else. As far as the sulphur, you are doing your part for the environment. Perhaps I should give you the names of about 40 farmers I know who run the dyed fuel in everything they own, including their large trucks, pickups, and tractors. I have a diesel pickup and I'm as sure as the sun will rise tomorrow, that if I run the dyed stuff in my pickup, I'll be stopped by the D.O.T. cops and put in prison for life. So, I'm at least doing my part for the environment with my "on road" diesel powered vehicle. No way I'm paying road tax for my tractor. For off road, I just had a load delivered last week for $189.9.