Yes, but it is illegal
The Navistar 6.0 is junk to begin with, so I wouldn't be too worried about that. As for off-road fuel, it won't hurt the engine, per se, as the 6.0 was manufactured prior to EPA2010 regs, but it is illegal to use red dye diesel in on-highway applications.
Off-road diesel weighs approximately 7.1 pounds per gallon.
Off road diesel is dyed but otherwise the same as highway diesel. The difference is in the tax. Highway diesel has a road tax on it
No. The only difference is a red dye added to off-road diesel to denote non-taxable use.
I have a 2006 Chevrolet C4500 Duramax Diesel and I would like to know how to turn off or reset the check engine light on the truck.
It is capable as long as it is off road use only. The off road diesel contains a red dye that stains the fuel filter, so if you're caught on road with red dyed filters or a tank full of red diesel you may get in trouble with law enforcement. Off road diesel does not have road taxes added to the cost.
Aside from being illegal, off-road diesel will plug your DPF.
Refer to the manufacturer's instructions for this one. On-road diesel is recommended for use in diesel motors in general. Remember also that on-road diesel used for purposes for which the use of off-road diesel would be legal is non-taxable, which, in the case of an on-road diesel fuel purchase, will be translated into a tax refund.
Since 2007 most diesel pumped at any station in the USA or Canada is ULSD, regardless if it's on-road (clear) diesel, or off-road (dyed) diesel. The only difference is the fuel is that by using it as off road the taxes are not the same and it is cheaper. Dyed diesel will not affect your engine.
In theory off road diesel is the same as that you would buy from the filling station although it may not be as pure or contain the engine preserving additives that the major fuel companies add to the diesel you buy at the filling station. In many countries the duty paid on Road fuel is Higher than that of off road diesel and as a result you could be breaking the law if driving a vehicle on public roads that is being fueled with off road Diesel.
You don't want to. Not only will it eventually have bad effects on your motor, but it's also illegal to use off-road diesel in a highway diesel motor.