Even the best homebrew biodiesel is not quite good enough to use in the newer piezoelectric injector systems, as it’s too thick. Older mechanical or electro-mechanical injector systems is okay to use...............
The problem is that “good quality biodiesel” is not the same as good quality diesel.
The nature of the oils is not conducive to clean combustion, lubrication, and cold weather functionality. No amount of fast talking or fancy footwork will change that.
“Biodiesel” could be used in specially designed engines, but the financial return would not be there to undertake that.
Biodiesel is a political game that needs to come to an end. Use the oil to make heating oil, or something of that sort, if you must, but leave the transportation industry alone.