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Yellow
the color and diesel is oily.
Yellow is the most common color used. If you used any other color be sure and label it Diesel.
green
In the USA, highway fuel varies from clear to yellow. Off road fuel is dyed red.
They can use either on-road diesel (billed out as reefer fuel, as its use is non-taxable) or red dyed off-road diesel.
Diesel engines run on diesel fuel. Gasoline will destroy a diesel engine.
Sulfer & water content....and if it's off road diesel fuel - the color. It won't cause problems to use diesel in a heating oil tank, but it will cause a whole lot of trouble if you use heating oil in a diesel tank
That is not necessarily the case nowadays. Diesel fuel was much cheaper because there were far fewer cars with diesel engines. Since many more cars have diesel engines now the various governments increased the tax on diesel fuel to increase the revenue it receives. As did the fuel companies to to a far lesser extent. Diesel fuel is almost always higher than gasoline. Reason being is the EPA regulations a few years back regulated that diesel be made much cleaner that it was in the past. It costs more to refine this clean diesel. Have you noticed that you do not see black smoke bellowing from diesel trucks anymore.
Diesel fuel is the only diesel fuel. Either Low Sulphur or Ultra Low Sulphur, depending on the emissions regulations of the country you're in. If your vehicle has an aftertreatment system, which can consist of just a DPF (Diesel Particulate Filter), or a DPF and SCR (Selective Catalytic Reduction) system which uses DEF (Diesel Exhaust Fluid), you can only run Ultra Low Sulphur Diesel in it, or you'll clog that DPF up within the hour, your engine will derate, and you won't be going anywhere.
A diesel generator can be any color you like...orange with pink polka dots would be nice. However, manufacturers are aware that diesel fuel stains things, so they generally paint with a color that doesn't show diesel oil stains too badly.
Yes, diesel is a bio fuel