Any one will do. Really. Mine's running on soybean oil at the moment (I find the original containers in the dumpster next to the waste oil drum...!) When I built the first one (Golf diesel) I ran a few gallons of new canola oil during setup. The great thing is when you spill it, it just washes off with soap and water - no lovely diesel smell (although I sometimes like that too...). To each his own...Remember to eat lots of fried foods...I need the fuel!

F