There are different grades of diesel fuel. #2 is good for summer temps & oil furnaces; it is cheaper & will start to form gel crystals below 20 degrees that plug up filters & fuel lines. #1 is a thinner, less BTU, more expensive fuel. It flows at very cold temperatures. You can order this & blend it with your summer #2 fuel for the temps you plan to encounter, or burn it straight. There are blends sold, to accomidate different temperatures. Commonally called 'winter blend'. There are premium fuels that are made of #2 & #1 that have lubricating additives & cleaners to possibly work better in your internal combustion diesel engines. These cost more. Typically, 'road fuel' has a hyway tax applied to it from both the fed & state governments. 'Offroad fuel' is dyed a deep reddish color and does not have this tax applied to it. Can be 20 to 40 cents a gallon difference. Either type of fuel can be burned in engines or oil furnaces, and can be made of any combination of #2, #1, and/or additives. Many people associate some terms with each other here, but that is never univerally true. Every region has it's own common blends of fuels - all made of #2 with perhaps some #1 added. It is possible to order some very thick unrefined types of diesel fuel up to grade #6, but that is not typically available or good for the engines & furnaces you & I come across. If you run dyed off-road fuel in a highway vehicle, be prepared to pay some heafty fines. They get serious about that. --->Paul
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