Originally Posted by
tjspiel
Basically you pull the innards out, let them soak in the oil for awhile, then put it back together. I believe that should be done every couple of years depending on your riding habits and conditions. I recommend it. The grease gets a little thick in cold weather. It might be my imagination but I can feel the difference.
It's not your imagination. IGHs feel like molasses at cold temps. I have a Giant Seek 0 (Alfine 8, Shimano hydraulic discs) and I'm doing an oil bath before winter. It has about 1200 miles on it right now after last winter. I don't ride that beast one mile more than I have to.
I just got the lockring tool so I can tear the tranny down, I need to remember to stop by the auto parts store on the way home and get some ATF.