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Another thing you may want to consider is running on used engine oil. I made a gravity fed contraption for filtering when experimenting with used oil in an M1009, but there was a commercially available setup - Oil Cat, if memory serves me - that was literally a push-a-button approach. Well, you had to remove the drain plug on the engine, but other than that...
Up to 7% used oil to diesel was approved for simple diesels like ours, as I recall, and the procedure is apparently common in Alaska on diesel powered generators.
Naturally I had to push the envelope, and at about 40% the M1009 was getting hard to start, and smoked quite a bit.
Still, it was legal even in CA, as long as the oil came out of the same vehicle that it was dumped into the fuel tank of. Not that I understand how they could keep track of what vehicle it came out of. With one oil change on the Pete alone, I had 10 gallons of free fuel.
An added benefit was that even a tiny bit of used oil made the fuel completely black. When I asked an oil analysis lab if it'd be possible to detect red dye in fuel with used oil in it, the answer was "Highly unlikely."
With all the used 10W I'm generating now, plus all the regular oil changes, I should probably look into starting filtering again.
EDIT: Found a photo of the Oil-Cat.