Well heres the deal this is what i am running in my bike 20w50 castrol gtx with 12oz of lucas.:biglaugh: Never had a prob last year. Some guy i no told me his buddy blew his bike up with regular motor oil:confused2:.I beleave there is more to the story than that.:ummm: I never had clutch slipping or any ticking in the motor.:clapping: I run castrol and lucas in everything i haveunk: so any info bad or good would help do not want to hurt this thing. thanks guys BILL