It's inevitable that you'll get responses ranging the gamut from "Every 3000 miles or you'll die!" to once a year or 10,000 miles, whichever comes first. Truth is most of us are old guys who grew up and learned to drive and do vehicle maintenance in an era when dino oils were 1) the ONLY choice, and 2) not nearly near as good as they are today. I'll chime in with my OPINION--which is at least as good as all the other crusty bastards on this forum (#becauseimafuckingrocketscietist)--and say that I'd do changes with dino (since that's according to the manual) at 6 month intervals or 6000-7500 miles, whichever comes first. I'm a bit surprised that Ichiro's peeps spec dino oil--guessing because of the clutch?--and I'd prolly either use a syth blend or full synth and change at 10,000 miles or yearly. I always use full synth in my bikes and have never had a clutch issue. And I'd change the filter at each interval since I hate the idea of contaminating all my hard earned dollars of clean lube with dark and crusty shit lurking in the old filter. But hey, it's a Honda so no matter what you decide, it'll eventually die LONG AFTER you sell it and move on to something new.