AMSOIL 10w-30 for wet clutches (motorcycle). I use AMSOIL in my trucks (gas and diesel), atvs, boat (6gal per motor) and car. I trust it completely but most of your oils out there are very good when you follow the maintenance schedule. Its personal preference. You cant go wrong as long as you use one designated for a wet clutch application.
Yeah! if you're racing! Depending on the type of ride (heat, desert, sand, water) you can go up to 15 hours of driving. I personally take the dipstick out and let the oil drip on a white rag and check the color of it and haven't had any issues for the 17 years.