Diesel #1, Jet A, JP8 are very similar, slightly different additives. Diesel #2, JP4, Jet B and Stove oil are also very similar with different additives. I have run all of the above fuels in our Alloette III helicopter over the years with no performance issues. This is not to say that any uneducated person can substitute these fuels at will. You might not live long if you fill your heli up with diesel #2 and fly to 10,000 feet. Like wise your boat engine will show premature wear if all you do is run Jet A. However, in most cases you can operate any Diesel engine on any of the above fuels.