Now zen my liddle German buddy. I zink you should be taking zis down to ze Gaylander zektion, ozervise you vill be shot at dawn.
(She's a lovely lass, is our Dawn)
I've been putting Castrol Valvemaster in the Guzzi for the last few years and it seems fine. The Guzzi needs the one with octane boost but I reckon your Airportable will need the un-boosted one.