If you purchased the engine from a hobby store or direct from the distributer then I would suggest you contact them first. I would guess either of those should know what they sell. If it was purchased from an individual and he does not have an eastern European sounding name then a good guess is that it is meant for the US market.

If the lowest nitro fuel you can get is 10% then run it on that. You will not harm the engine. Some time ago, on this Forum Dar Zeelon gave a full description of how to break in an ABC engine. Follow it and you can not go wrong.

Ed S