Hub Leak?

and use a high temp grease.

You probably have two or more different types of grease in your hub that are not compatible with each other. The grease tends to liquify and leak. Try cleaning out all the old grease and repack your bearings.
Dave

It's pretty common for it to leak out around the edge of the dust cap. I always run 3-4 layers of electrical tape around the seam after cleaning it well. You could run a bead of caulk instead.

I suppose it could come out of the hole with the bad plug, but that's unlikely unless it's overfilled with grease. The grease would need to overcome centripetal force to do that. And it didn't, looking at the pictures. It would let dirt in, though.

Took the cap off and this is what I found:

Lynnmor wrote:
I would worry more about dirt or water that may have entered. If it were me, I would disassemble and service the hub.

Does that mean repack/grease the bearings?

SidecarFlip wrote:
Maybe, maybe not. Pull the cap and have a look.

Any tips on how to pull the cap off?

I would worry more about dirt or water that may have entered. If it were me, I would disassemble and service the hub.

Maybe, maybe not. Pull the cap and have a look.

I would check the seals.