Now I'm confused , you asked about bio-diesel , all those were about bio-diesel , the Trickel guy , I think his 1st book was , From the frying pan to the fuel tank .
Bio diesel come from almost any oil vegi & animal that is out there , but the volume is from new vegi oil & thats mostly soy bean because of , special interests - commercial , then the book Trickel he is about processing waste vegi oil for individuals making at home .