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I believe that #4 fuel oil is #6 fuel that has been cut or thinned out with #2 diesel. This would also be too thick to try and run through your filters and IP.

Years back we used to make #6 bunker oil at the refinery, it was basically tar thinned out with a lighter oil, very messy and very viscous (a little thicker than honey). It had a very high BTU value; however I wouldn't use it in a diesel, it works good for boilers or steam generators.

I've worked in a refinery for over 20 yrs. and part of that time in the laboratory. The jet fuel that we make, we call ATF (aviation turbine fuel) not to be confused with auto-trans fluid. If it meets the product specs. for ATF (flash, distillation, corrosion, smoke point, freeze point...