locally to me there is a bio deisel garage, i used it for several months. recently the van was running rough so i thought injectors were needed,
. decided to run some normal through it and problem disappeared.
omho while running clean veggie oil @ 50/50 is likely fine, using ex chip/kebab shop oil you are going to need some decent filtering and a way of controlling the stink - well, if you like your neighbours being friendly
TT