I use the Morgan Fuels Omega 10 or Omega 15, and have never used afterrun oil in my engines. I've opened them up, and the insides are thoroughly oily, so I believe their claims that you don't need after run oil. In fact, the corrosion inhibitor is probably more effective than just after run oil. I run the fuel out at the end of each day, empty the tank, and often leave the engines for weeks at a time (in the winter).

There are vast numbers of threads debating the need for ARO, and what works best. Believe the engineers that designed the fuel or not, your choice.

Brad