Biodiesel fuel is an alternative fuel that is made from 100% renewable resources, and is very clean burning. Biodiesel is also known as biofuel and is considered the fuel of the future. Biodiesel does not contain petroleum. Biodiesel fuel can only be used in diesel engines, but can be mixed with petroleum to be used as fuel in a number of different vehicles. Biodesiel is biodegradable and is non-toxic. Table salt was even proved more toxic.
Vegetable oil can be thicker than conventional oil. Vegetable oil releases 100% less SO2, 78% less CO2, 48% less carbon monoxide, 48% less asthma-causing particulate matter, and 80% fewer cancer-causing hydrocarbons. For Vegetable oil to work it has to be clean and hot. In winter vegetlable oil doesn't work properly. The bad thing about vegetable oil is that it reduces engin life. (Alternative Fuels)