Watch the fuel delivery guys, when they deliver to your 2/3/500 gallon tank the last thing they do is add the dye to the tank, next stop may be a farm for road use, comes from the same tank on the same truck, fuel oil for heat, if number 2 fuel oil again same truck, same tank.
Big myth that the farm fuel is any different from road fuel or fuel oil for furnaces, all No.2 fuel oil unless buying a winter blend of No.1 and 2, the dye is the only difference with the road taxes. Have been a fuel hauler, mechanic, driver and farmer, so far this is as true as the Earth revolves the Sun. Ask your supplier.
Be careful adding that motor oil, known to have detergents blended in and can cause deposits in the fuel system, does not burn as well or as hot generating lots of excess carbon and as for lubricity it adds so little is of little value diluted in fuel. Fuel additives are what they are made for, engine oils are for lubricating and cooling engine parts undiluted. Ask of any fuel system repair shop and they will explain it same as here. BTW, using ATF in your personal or company truck, think twice as it turns the fuel Red, a sign the DOT is always looking for.