S
As has been pointed out, sunflower oil is just another variety of veg oil. We currently run both our P38s and my 300tdi disco on a diesel/used veg oil mix at about 40/60 in the disco and 30/70 in the P38s, though we'll be thinning down the mix somewhat for the winter, most likely 50/50, but we'll see how they run and how cold it gets.