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Yeah it needed some attention, I don't think the previous owner even changed the bath oil.

I am surprised that so much can wear off the seal without the seal failing.
"Quad" rings have 4 (2 exposed) sealing surfaces. They can take quite a bit of abuse before they fail, compared to an o-ring. More friction, though.

Unless there are chunks of rubber (in the grease/missing), you're fine. New seals mean higher friction, so if it still seals reliably, use it.
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