Did the valves require any adjustment? Most of the guys with high mileage who have checked theirs didn't require any changes, so I'm wondering if your bike was still in spec or not at 48k miles.my gsx-s1000 just got back from the dealer for its valve check at 48K.
engine looks clean and i use the Motul 300 since day one. change oil and filter every 6K myself.
never had any mechanical problem.