All of you are confusing Biodiesel, WVO and ths snake oil diesel secret. They are three different fuels all based on veggie oil. WVO, if properly filtered and heated can be a great fuel for a diesel. Bio diesel which I make my own home brew and run in two PSD's is another excellent Veggie based fuel, that goes through a chemical changing "transesfecteration" Yes it uses lye and alcohol and removes all the food, and glycerine from the fuel. ( actually reaction is more indepth but read that another time) Diesel secret????? Good luck with that. Basically how it works is it uses thw WVO idea and takes the other materials added to it to THIN the oil, to a specific gravity less then 0.900. Very snake oil remedy and harmful to the motor etc. Unfortunately people think it is Bio diesel and BD gets the bad wrap for it.