My conclusion: I'm going to continue running 10w30 synthetic oil in the gearbox. Also keeping the stock top & bottom end (not going to kit to be safe). Ordering an estoril sidebleed pipe and upjetting from the stock 51 to a 56. A better intake and carb (say 15mm or so) along with an assortment of jets and a 27 tooth front sprocket and maybe a 20 rear (stock on my bike is 26/22) is also in this bike's near future.