What's really necessary, though, should be determined by the type of riding you do. For instance, a lot of in-town riding with extended periods of stop-and-go traffic, riding in a dusty environment or frequent racetrack use is considered severe duty for an engine. If your owner's manual doesn't offer oil-/filter-change intervals for such conditions, then you should consider shortening the normal intervals. For our own motorcycles, few of us here would run a bike longer than the owner's manual recommendations. As one staffer's father said, "Oil's cheaper than main bearings." Act accordingly.