Growdiesel rdiesel is a form of diesel fuel which is derived from renewable feedstock rather than the fossil feedstock used in most diesel fuels. Rdiesel uses traditional fractional distillation to process the oils. It is not biodiesel which is chemically quite different and processed using transesterification. It has a high cetane value, a lower gravity, good cold flow. Rdiesel is completely compatible for replacing the existing fossil diesel and transportation fuels infrastructure