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Viscosity is a good measure of whether a waste oil-based fuel will run in a diesel engine. So, is measuring its specific gravity, and measuring its specific gravity is easier and cheaper. No filter will remove all of the sediments in WMO, because the sediments are often submicron in size, so...

I do not happen to believe that acidification takes place with heavily burned WMO, but it might. However, my data shows that a fraction that melts at 160F (71c) occurs, and I believe it is the product of polymerization due to excessive heating, number of heat cycles and age. A centrifuge will...

If the WMO is not ancient, such as the WMO that others have report here coming from natural gas compressors, then it will most probably blend just fine with WVO. However, if it is black, then probably not. I forgot to leave a link to my research on what happens when you blend old, burned WMO...

I have mixed a wide range of new and used oils, with a wide range of new and used solvents. I have had no issues once I learned to settle those blends in the shade for at least 2 weeks, then I must be careful to remove the sediments from the translucent fuel blend, prior to filtering. However...