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Depends...by "diesel tractor" do you mean "farm tractor" or "semi tractor"? You're SUPPOSED only to put off road diesel in a farm tractor. That's why they make it. If you have put it in a semi tractor, get hold of your dispatch/brief/lawyer right away for advice on what to do. If you have a pre-2007 engine your trouble is almost exclusively legal. If your engine is 2007 or 2010 compliant, you're probably going to screw up your EGR and diesel particulate filter, which will break your engine.
yes,it is safe to put off road diesel fuel not only in tractor but also in other vehicles
in Canada - 15 to cross a road , 16 to drive on a road.
It is a tax issue. Dyed diesel fuel is not taxed, and as long as the fuel is used on the farm it can be run in anything, but when dyed fuel is used on a road vehicle you are cheating your state and town of tax revenue needed to maintain roadways.
If not the tractor itself, then it's almost certain the business would have to have some sort of general liability insurance.
Yes. The difference is that off road fuel contains purple dye. If the tractor is older you may want to add some tranmission oil to the fuel as new Low Sulpher Diesel does not lubricate as well as the older diesel. As well you can add a diesel fuel conditioner which helps restore the lubrication properties of the fuel.
You can not legally use off road fuel in a licenced road vehicle
You mean, like you've got a tractor that's got off-road diesel in it and a public highway running through the middle of your field, and to get from one half of the field to the other half you must drive across the public highway? Perfectly legal--they know that's common practice in farm country. If you needed to drive the tractor from the field to the grain elevator and it was full of off-road diesel, that's probably illegal but I don't think there's a cop in the US that's a big enough jerk to pull you over for doing it. I wouldn't recommend filling the truck with off-road diesel and driving a hundred miles in it; some cop in the city who sees your farm plate might pull you over and look at your fuel. (City guys are thinking, "LOOK at it?" Yeah. Off-road diesel is dyed so you can tell.)
Depends on your country laws. I.e In the UK a farm vehicle that has to travel on any road other than that of the land the farm is on will require taxation and insurance to do so.
(in the US) In general it can safely be said that you may operate a farm tractor on the public roads ONLY from farm to field, or field-to-field. You may not use it for 'destination' driving of any type.
Typically, displacement. A semi truck is technically a tractor. The infamous Cummins 5.9 direct injection diesel of Dodge Ram pickup fame was originally developed for farm tractor applications. Displacement of tractor motors may vary, dependent on size, function, etc. For a road tractor, 11 - 16 litre displacement is typical (most in the 12.7 - 14.6 litre range), whereas a dump truck may be likely to have lower motor displacements, but could also have just as high a displacement as a road tractor, dependent on how the truck is specified.
Generally, if you will be driving the tractor on private land, the adults in your life can make the decision as to when you are old enough to safely drive the tractor. If you are 16 you can take your tractor driving test or if you have passed it then you can then drive it on the road.