Diesel isn't even a good UCL when run 100% in a diesel engine. It would do you no good.
If you want an UCL, stick with 2-stroke, Marvel, Neutra 131 or 131c, Lubrigas, Moreys, Klotz, FP60, Tru-Blu, or Lucas in your fuel.
Biodiesel, if available near you, is an option. B100 will lube and clean.
Nothing to worry about with diesel and cats or o2.