I don't believe I've mentioned this on the blog yet, but I am officially running the rabbit on used motor oil (as well as vegetable oil). I wasn't able to find enough vegetable oil (driving 1400 miles a month for work will do that) so I did research regarding other alternative fuels for diesels. Turns out, the rules that govern the use of vegetable oil apply to motor oil. It is simply the viscosity at lower temperatures that you have to work around.
That being said, I think I have been extremely successful in this venture. I've been running on motor oil since the middle of May and have seen no major issues. The one minor issue I am fighting with has to do with my starting troubles. I believe I am not purging long enough to get the motor oil out of my engine (as motor oil is designed to lubricate, thus making it difficult to flush completely out of the fuel system).
I've been purging much longer recently and having a little better luck starting, but I'm still having trouble. If I drive on diesel for a bit (after purging) then I have no difficulty starting. Since I have a plentiful supply of used motor oil, my decision is to continue running on it. However, I go through diesel faster as I have to purge longer. I might try diluting the motor oil a bit to see if that helps.
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