On my limited with the stock shocks, I took them off the bike and used a MityVac to drain the fluid out. Reinstalled on the bike and used a threaded nipple and a long clear hose to replace fluid. Put in 10ozs of 10wt shock oil and topped it off with 2.5ozs of 15wt. It ain't perfect, but it's tons better than it was and at a minimal cost.

2010 Limited with some stuff!!