Hi! I currently own a cb500x and have a long commute every day (70km/day). My question is should I stick to the 12,000km oil change interval stated in the owner's manual? I've tried both synthetic and mineral oils (haven't tried any with ester yet though) and when it gets to around 6,000-8,000km it starts to get a bit harder to shift and so far (27k km total) I've changed the oil every 6,000-8,000km. I've ridden a lot before, but this is the first bike I've ever owned so I'm not sure! Honda Big wing guys (where I get it serviced) say it's safe to go 12,000km between oil changes, but that seems really high to me- we used to change my dad's xr400r oil after 3,000km but that's obviously a much older machine. Any tips from experienced riders as well as any updates I need to know about newer bikes? I really appreciate input from riders who know the conditions in Southeast Asia (especially Thailand). Also, does oil brand make much of a difference? I've mostly stuck to popular brands ie motul, penrite and honda... Thanks so much!