My '06 lives in a climate controlled garage (battery tender always attached), and gets fluid changes and maintenance every two years. I only have 5,075 miles on it. When I bought it I was still riding a lot, but had three bikes. Shortly thereafter, my riding group disappeared. Two found golf and stopped riding, two people moved, and the only female in the group got married, and her new hubby didn't want her riding. I don't ride much at all in the summer (too hot and humid and won't ride unless all gear is on). Recently found a buddy to ride with. Neither of us knew we rode and we both ride GS's. The shop that takes care of my bike (local dealer is lousy, so I won't use them) told me he doesn't believe that the final drive fluid needs to be changed. I don't know enough to make the call on that based on time or miles. Should I have it changed, and if so what should it cost?