I have kept an old '77 240D Mercedes for just this kind of experiment. I figure that the simpler mechanical fuel injection systems would be better candidates. I figure that I drive the MBZ around town and local trips and the $$$ I save running it on VEGGIE OIL would off set the price of fossil for the DODGE. I wonder though if even veggie oil would get too thick in winter. I might try this on my old Benz and if so, I will report to the TDR masses.