A few weeks back on Doomsday Preppers they were showing the one young family from Utah that had a '70's era deuce and a half that was "multi-fuel" capable. The guy claimed it would run on basically any liquid fuel including used motor oil. Showed him filling up aux tanks straight from a Jiffy Lube type oil change place. Call me stupid, but I have never heard of any military vehicle running on used motor oil, much less a deuce and a half.
What am I missing here, and why is that not being mentioned more as a fuel source for a SHTF scenario? I know all about the veggie oil conversions for the diesel vehicles, but this sounds like it would be the most economical and plentiful fuel source out there. Hell once everyone elses cars/trucks run out of fuel you can drain their pans and get a gallon or more from every vehicle you pass. Not to mention being able to stockpile it now for next to nothing. I'm sure several of the oil change places would probably even give you a few bucks on top of it, considering how much you're saving them from disposal fees.