Merry Christmas! Fuel prices got too high for me this summer and after spending $900 in fuel in one month I got to thinking. Diesel can run on a lot of different fuels, Veggi oil, peanut oil, ATF with no problem... what about waste motor oil? I knew a man who used to work on the pipeline up here in Minnesota years ago. Before they went to electric pumps in the 80s the oil was pumped by 2 cylinder Nordberg diesel engines that siphoned off crude oil from the pipeline and ran it through centrifuge to clean it up a bit. Ocean liners run on waste motor oil... why not my diesels? So I started running it in my 81 Cadillac, my 95 powerstroke... and they loved it. My 95 stroker quite leaking fuel because of the damage of low sulfer diesel fuel these days. I got better fuel mileage, but it smoked like crazy. The 81 Caddi didn't smoke at all and it ran great. Then I bought a 2006 jetta TDI (my 3rd Jetta diesel over the years) replaced the camshaft, flywheel, wheel bearing, two broken off glow plugs, and deleted the egr that was leaking. I advanced the timing to 1.5. When I ran it on W85 which is waste motor oil with 15% e85 (use ethanol to soak up any moisture in oil and it smokes way less than RUG regular unleaded gasoline) the mix was too think for my clogged fuel filter, so i run 25% D1 and 75% W85. To my utter amazement, the car still starts even down to -15 farhenheit even on that mix! I have a fuel filter heater on it and will be putting an HHO kit on it to clean up the exhaust smell. Anyone else doing this? What have you found that works?