Is Off-Road Diesel Detrimental to Mower Diesel engines

Discussion in 'Lawn Mowing' started by Sugarridge, Aug 22, 2007.

  1. Sugarridge

    Sugarridge LawnSite Member
    Messages: 14

    A dealer told me not to use Off-Road Diesel in my Kubota powered Exmark 66" XS because it would foul the engine and plugs due to the limited fuel filtration. Any thoughts out there!
  2. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    This is quoted from It is an engineering forum....

    The difference between OFF-ROAD diesel and "ON-ROAD" diesel is that OFF-ROAD diesel has more sulfur in it. Sulfur acts as a lubricant for fuel pumps and injectors in diesel engines. The operational tolerance in an injector is about four millionths of an inch so the sulfur lubricates the moving parts inside of the injector. In 1993 the EPA changed the sulfur content of on road diesel to 500 PPM (parts per million) this was then called LSD (Low Sulfur Diesel). Now in 2007 they are requiring it to be changed again to 15 PPM this is called ULSD (Ultra Low Sulfur Diesel). Another difference is that ON-ROAD diesel is taxed and so to tell the difference between ON-ROAD and OFF-ROAD the OFF-ROAD diesel is dyed red.
  3. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Not going to hurt your engine, if you can get it, run it!
  4. KTO Enterprises

    KTO Enterprises LawnSite Bronze Member
    Messages: 1,286

    It wont harm anything. Your pocket book will even feel better. Off road diesel does not have the highway tax.

    On another note, at one time I had a for you could fill out to get the road tax back on gasoline that went into off road equipment. now I just have the tax office do it for me.

    Makes for a nice little rebate check
  5. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Messages: 4,720

    There is NOW, no difference in on or off road siesel. It is all the same quality. Only difference is they put red dye in the offroad to show that it is beig sold with no tax.
  6. fastcutter

    fastcutter LawnSite Member
    from west tn
    Messages: 240

    I have 19 Grasshopper mower and we have run the Off road diesel for the very start. Hour on the mowers start at 10 to 6000 right now.
  7. Grits

    Grits LawnSite Silver Member
    from Florida
    Messages: 2,994

    I have a friend that runs it in his personal truck. He has one of the new Ford diesels. He has done some mods to it and it hauls azz. The only difference in on and off-road is the color.
  8. T Total Lawncare

    T Total Lawncare LawnSite Bronze Member
    Male, from The deep south
    Messages: 1,437

    :nono: :nono: :nono:
  9. ffemt1271

    ffemt1271 LawnSite Bronze Member
    Messages: 1,285

    here's a little trick, get a clear glass jar, put some tyed diesel in it and set it out in the sun, it will bleach the dye out of it. not sure what it would take to do it on a large scale bit i thought it was neat
  10. captken

    captken LawnSite Bronze Member
    Messages: 1,704

    When I worked tug and barge, we moved petroleum from refineries to storage facilities.

    We would load diesel fuel down the same line/same shore tank, as 2-oil/off-road diesel. You would have to gauge your tanks to know when the 2-oil/off road diesel which is dyed, got to the barge when you made the product change over, as not to get non taxed dyed diesel into the taxed no dye diesel, you can put the dye in, but you can't take it out.

    It is a powerful dye.

    Load diesel first.
    2-oil or off road diesel next.
    Product coming from the same shore tank down the same pipeline.
    They would inject the dye before loading into 2-oil/off road diesel tanks.

    Some times the dye was added directly to the cargo tanks after it was loaded.

    The dye is for tax purposes only.

    It is perfectly legal to run off road diesel in your mower.

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