Could I use red diesel in a diesel generator legally in the UK? Can I add vegetable oil to this and if so, in what ratio? Where are good sources of vegetable oil?
Red diesel is agricultural, no tax or tax reduced. The Red is only a dye to distinguish it from tax paid diesel. However using it illegally can result in very hefty fines if caught. Used and cleaned vegetable oil can be mixed with diesel, actual proportions I'm not sure of, but I think 3:1 oil to diesel. There are probably sites that explain in more detail. However why it has to be used veg. oil I don't know.
