G'day Mate,
Quote: Even Morgans themselves say that you should use their Pink (castor/synth blend) oil in an ABC engine. End quote:

Of course they say that, they want to sell more oil, you need to use around 25% of the red oil in a aircraft engine, because it was originally designed as Heli fuel.
I use the coolpower blue in everything 2 strokes & 4 strokes, ringed, ABL, ABC, whatever, if you run any of them too lean, or don't have your tank setup correctly, they will let you down, no matter what oil you use.