Join Date: Oct 2004
Location: Oakville Ontario
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These hubs are or were grease packed when new, but Shimano has recognized that oil lubrication delivers superior performance and durability. I attended a Shimano service clinic where the oil dip procedure was demonstrated, but of course they recommend their own (very expensive) oil.
Many people have reported good results using good old garden variety ATF.
I'm running a long term test case running an Alfine hub, essentially the same animal as your Nexus on ATF. The owner of this hub rides about 3,000 km per year. The first oil dip was done at 3,000 km, the second at 6,000. I anticipate doing the third oiling this fall at 9,000 km.
Here's a video I made while doing the second oiling. The process for your Nexus is identical with the exception that the drive side dust cover is pried out, it is not screwed on.
I would also add that shifting issues with these hubs are almost always related to poor cable routing, or poor cable condition. I sold a ton of these hubs in my shop, and resolved shifting issues externally 100% of the time.
Last edited by Dan Burkhart; 04-17-12 at 06:00 PM.