sorry, yes i was only referring to veggie oil with regard to temperature.
the recycling idea i definitely agree with, still have to be careful with used oil tho, since it can often be quite acidic, depending on what's been cooked in it.
there's a place up near Stroud (the Green Shop) who do biofuel from recycled oil, so i might have a chat with them, tho i am tempted just to avoid trouble with the Pekins, so will have to check it out.
the one thing i'd love to do - money no object - is to get hold of a merc engine and get it converted by Elsbett (in Germany), so it could run on straight veggie oil... tho saying that, i do love my old Perkins, always fires up first time and got me over the Pyranees ok!