New (Old) Fan

[saturnmorning]

Greetings Friends,
I have a Hunter fan here... model #s 23554, 23606, 25606 (all are listed on the plate riveted to the housing).
Removed the cover plate (bottom plate), disconnected the cap and wiring. No problems.
Very impressed at the quality and simplicity of these fans, especially the casting and sheer weight. Weight = Enduring Quality.
I have questions regarding lubrication and the oil seal (the bottom seal, which feels like its made of leather).
Here is the stator and shaft.
 
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Should I remove this "heritage" grease and reset the rotor using automotive weight grease? My question is really how the oil weights differ between the shaft and the bearings. My sense it that the shaft prefers heavier oil and the bearings a lighter weight. Next question: Do I need a new seal and if so, where to source it. See below:
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It feels like its made of leather (the O ring). The bearing set is very clean and turns with precision. Feels smooth and 100%. Below is the rotor. I'd rather not remove old grease if simply adding wd40 will recondition it. I really only want to replace what NEEDS to be replaced and nothing more. The existing O ring looks very good (no cracking or warping). I'd be happy to replace the O ring if 1) I need to and.. 2) I knew how to acquire a replacement or fabricate one. Any thoughts friends? 
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[markwelker]

zoom spout is what a lot of collectors recommend for oil. the oil weights for the shaft and bearings as far as i know are the same (just finished restoring and repainting an older 22272 model) and the oils weights are recommended around sae 10-15. the o ring at the bottom of the oil reservoir should be replaced but doesn't need to unless it leaking of course. as to the one on the bearing it should be fine and leathery. never heard of one of those needing to be replaced.  if it needs to be replaced i think i heard about getting a new one from ace hardware stores? not sure if that's right though.

[Jordan U]

Zoom Spout is a good oil to use, or you can buy actual Hunter oil specifically for these fans. The seals look okay to me, but the better determination would be by now they feel. If they're still flexible and don't look to be cracking at all, then I'd say they're probably good to reuse.

The stator in these looks a bit smaller than that in the 22272 models(?), but if you still have this open could you please measure the height of the stator in MM?