I change the oil in my Rohloff geared hub annually - using the "official" kit every time so far.
It will be cheaper to buy the oils in bulk, I can find them easily on the net. Some questions though:
The kit includes a replacement plug (or is it called a bung). Where can I buy these? Rohloff only seem to sell them as part of a kit. More to the point - do I need a new plug each time? Or is it only the sealant that needs replacing? Is loctite OK for this purpose?
There are two fluids involved - one is a rinsing oil of some kind, the other is the replacement lube. Is either likely to go off in anyway over time? (or should I keep using the kits with will come fresher fluids)