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The exact difference will depend on who your supplier is. #2 High sulphur diesel has up to 5000 ppm of sulphur. It can only be used as off road and will always have a red dye added. #2 Low sulphur diesel has up to 500 ppm of sulphur. It can be used on road in all 2006 and older vehicles. It can also have a red dye added and be sold as off road no tax fuel. #2 Ultra Low sulphur diesel has up to 15 ppm of sulphur. It can be used on road in all vehicles including 2007 and up. It can also have a red dye added and be sold as off road no tax fuel. Since all stations want to be able to sell to all buyers including owners of 2007 trucks they stock Ultra low sulphur at most stations. Since bulk tanks are very expensive to buy and maintain most suppliers just add dye to the Ultra low they already have in stock. If you buy from a large supplier that sells a lot of off road fuel they can justify the extra tank cost so may have lower grades of off road diesel available. You can also get lower grades of off road diesel if you have your supplier load it at the loading rack and deliver a transport load direct to you. The minimum delivery charge for diesel from a transport truck is based on 7000 gals. The differance between #2 off road diesel and #2 heating oil is the code the computer charges for the load. It is loaded out of the same tank using the same hose. The computer only charges it differant. The differance in most heating oil that consumers buy is due to the fact that the supplier adds #1 diesel or kero into the #2 to keep it from jelling in the tank.
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