As far as I know, offroad diesel is normal fuel with dye in it, with no other difference. Nothing I've read contradicts this, except some Internet guessing that offroad diesel is not low-sulfur. I doubt if it is any different from road diesel, because I doubt that refineries would make separate (expensive) runs for offroad fuel. I do like to dump a little oil in my diesel fuel so my 003A's injector pump gets some extra lubrication. Crankcase drainings from my various engines is my favorite lubricant.
I am the Class a fuel system operator for my Lodge.
We have fuel delivered twice a year.
Gasoline for ATV's and snowmobiles and Diesel for our Skid steer and Logan Snowcat.
Our Diesel is Dyed diesel.
I have the delivery ticket for 2,000 gallons of the stuff right here in front of me.
It is composed of 25% #1 diesel (lower paraffin for winter ops)
and 75% #2 diesel.
The red dye is added at the fuel distributor before the tanker left their yard.
The total Sulphur content is 15ppm.
The only difference between summer and winter pump diesel is the percentage of either #1 or #2 diesel in the mixture.
The only thing that makes "offroad" diesel any different is the red dye they add to it to show that it is not taxed for highway use.
I cannot sell you my red diesel even if you run out of fuel in my driveway.
Have to siphon it out of my personal truck.
The penalty for sale of offroad diesel is a fine and potential loss of our fuel dealership license.
"For use in all nonroad diesel engines. Not for use in highway vehicles or engines except for tax-exempt use in accordance with section 4082 of the internal revenue code."
There is no difference in Sulphur content between #1 and #2 or any mixture of which you can buy or find anywhere..
Or at least from Phillips 66 from which, we get our fuel.