I ride year round here in Arizona. I change my oil in the spring so that it is new before the hot weather arrives. I use mobile one pure synthetic 15/50, (I would think 10/30 or whatever would be fine also). I use the 15/50 because we can go from the high 20's to 120 degree's, and I feel this covers all bases? I also use an additive called Tuf Oil. I use a K&N 147 filter. I only change my oil once a year. I do the same with my auto's. I have never had an engine break down. My truck had 324,000 miles on it when the head gasket blew, and was still going strong. Synthetic oil's do not break down as petroleum oil does, does not mix with combustion chamber gas's etc. With good quality air filters keeping out the dirt/dust and so on, as well as good oil filters, I feel this should pose no problems. I just turned over 50,000 miles on my 2007 carbed X500 yesterday. Run's better than new.
P.S. If I am going to run into the higher miles any given year, then I would change more often, (such as with my truck). But an oil change every 1000, 3000 or even 5'000 miles etc is over kill to me if u use the right oils and such.
