Biodiesel is much cleaner than fossil-fuel diesel (dinodieser). It can be used in any diesel engine with no need for modifications -- in fact diesel engines run better and last longer with biodiesel. And it can easily be made from a common waste product-- used cooking oil.
Biodiesel fuel burns up to 75% cleaner than conventional diesel fuel made from fossil fuels Biodiesel substantially reduces unburned hydrocarbons, carbon monoxide and particulate matter in exhaust fumes Sulphur dioxide emissions are eliminated (biodiesel contains no sulphur) Biodiesel is plant-based and adds no CO2 to the atmosphere The ozone-forming potential of biodiesel emissions is nearly 50% less than conventional diesel fuel Nitrogen oxide (N0x) emissions may increase or decrease but can be reduced to well below conventional diesel fuel levels by adjusting engine timing and other means Giodiesel exhaust is not offensive and doesn't cause eye irritation (it smells like French fries!) Biodiesel is environmentally friendly: it is renevable, more biodegradable than sugar and less toxic than table salt (US National Biodiesel Board)