Actually, no.
I had a friend who worked for Caltex then Shell.
Even tho they tried, distributors in Australia/NZ would go out of their way to say absolutely nothing.
Oil formulations here have a number of differences to even the same branded product in the manufacturers home company.
I agree with going with premium brands.
It seems like most 10-40 or 5-50 oils (synth or semi-synth) would work in Rotaxs, obviously no friction modifiers so the car oils are out but all the premium motorcycle oils should work. Unfotunately the mc oils are as expensive as Aeroshell.
Big question; what is the legal situation ? No guesses please.