[Red Herring]

Sookie, do you know if they found anything lose inside the forks last time they changed the oil? I do the forks on my competition bikes once a year or so but I've got road bikes that I haven't done for over five so as Rictus says how often it needs it will depend on the kind of use, or abuse, they get.

Sometimes the act of taking them apart to change the oil tightens up whatever is clunking, or it may be that the oil is borderline on your bike and as it ages and loses some of it's viscosity it stops acting as it should, either way an oil change is fairly simple to do.