veggie oil
I have 2 of my farm tractors running it and my Mack dump runs it. . All doing great so far( 2 years now). If you have the ability to get the oil and it is clean(fairly) not miling in color then you are half way there. . The biggest thing is getting it free of water. My one tractor runs veggie oil only, I switch it back over to number 2 when it starts getting cold... . GO to greasel.com they are the best ones to talk to... Good luck, Marc