This summer I'll be experimenting with waste oil as a fuel source. I now have info on how to cheaply convert waste motor oil or waste fry oil to diesel fuel and heating oil. This may be the holy grail of how to keep things warm in the northern waste lands. My dream now is to get a diesel generator to power my greenhouse, and use the wate heat from the engine to heat it. I'm hoping to either be off the grid, or selling to it more than I buy.

I'll keep you posted. Currently I plan to use a combo of Frantz TP oil filters and a centrifugal oil filter to remove particulates. Additives are added to thin the oil and make it act the diesel fuel. It looks like you can convert waste oil to usuable diesel simulant for under 50 cents a gallon.