BD100 is currently only recommended standards, not mandatory standards, bio-diesel on the market have varying quality. The biodiesel quality producing from cooking oil as raw material has large impact on the performance of biodiesel blended fuel, in using may increase oil emulsion, oil filter clogging, microbial growth, metal corrosion and other risks. Biodiesel blended fuel storage, transportation and normal use of the vehicle have been brought some hidden dangers.