Hi Billj,
What state are you in, that may have a bearing on the oil to use. General 20 W 50 works well, I use a Diesel rated Penrite HPR 20W50 Extra 10 and a Repco ROF135 filter. Its cheaper than oil and filters from Honda.
There are many threads on oil in here.
I use the Diesel rated oil, because it can take more punishmnet than bike rated oil. I change the oil every 12 - 20000 Ks. The oil lasts well, performance hasnt changed and the bike is just short of 170000 Ks.