On bigger turbines you get: this “Kerosene + 4% oil. Diesel allowed but not recommended”. For me, when I hear not recommended, I don’t do it. Obviously through time and development of their turbines Xicoy realizes their turbines don’t do well on diesel. All my other turbines are doing well on diesel so regrettably I won’t be using Xicoy turbines even though I feel they probably make some of the most advanced turbines for our hobby. If kerosene was as available as diesel in my region I would probably switch fuel types.