Cleaner and renewable, biodiesel lowers exhaust emissions. Bio-diesel is also a powerful solvent and will de-coke clogged inefficient engines, which although is an excellent long term benefit, it does result in the need more frequent filter changes. Bio-diesel will destroy natural rubber – it is essential that engines using it do not have components made of rubber (most post 1990 engines use poly-urethane). Bio-diesel does not however contain any antifreeze agents (highly toxic benzene) and so during the winter months it must be mixed with its traditional counterpart to ensure it remains effective.Biodiesel is non-toxic and degrades approximately four times faster than diesel (within 28 days). Pure biodiesel (B100) degrades 85% to 88% in water. There is a waste product in producing biodiesel, but it is harmless (glycerin). This can be composted naturally or collected by local chemical companies depending on the area.