FWIW, I sold my 01 Aprilia RSVR with 43k miles on it. I bought it with less than 9k miles.
I've used mostly rotella 5w-40. I don't ride in very hot temperatures
I also tried motorex 15-50 and 10-60. they actually lessen shift effort.
please do not fill it to the top line. this is a dry sump engine. too much oil will also slow the drain from the head and you end up with alot of oil in the airbox from the PCV system.
I've had zero clutch issues other than the difficulty getting neutral when cold.