I went to the Biodiesel Expo in Newark today. It covers vegetable oil as well as biodiesel, although the majority of exhibitors were focused on biodiesel. There were many suppliers of equipment for pumping, filtering, washing, transesterifying and testing biofuels. Amongst the many equipment suppliers, there was a company that makes engine oil from plant oils. They only sell it in bulk, but if I can get hold of a sensible quantity, I will use it for the next oil change.