My '05 XB9SX turns 4000 and a hair at 75...couple of weeks ago I took a 2000 mile round trip at air temps of up to 100degrees (600 mi first day, 400 second both ways)... no oil use, a bit of a sore butt, but I get that way in a car after that many hours.
No vibration fatigue.... a lot smoother than the '86 sportster hotrod I sold to get the Buell.