I discovered that the North American (Canada and the USA) recommended oil change mileages in the owner's manual (every 6,000kms, or 4,000 miles) - are MUCH less than the recommendations for service in the owner's manuals in the rest of the world: (10,000kms, or 6,000 miles). Same recommendations for oil - YAMALUBE, or API SG or better OR JASO MA. Same for the FZ07/MT07 series. So I ask "Why does Yamaha recommend more frequent service for the North American motorcycles?"