Iodine value and biodiesel: Is limitation still appropriate?

Summary Iodine value (IV) limitation of biodiesel is currently one of the most discussed topics within the different world-wide biofuel specifications. Claims concerning engine operability on high IV feedstocks and biodiesel are interrelated. Also, the limitation of feedstock is a major problem for producers as well as for biodiesel trade. In this context, it might be time to re-evaluate the IV parameter. Based on available data, reports, and experience in this field the enclosed considerations maybe will help to answer the (admittedly provocative) question: Is IV limitation still appropriate?