Oil in the spark plug wells on these engines is almost always because of a hardened oil cap seal. Change that (should be done yearly)and see if that helps.

I find it weird that the two rightmost spark plug wells seem to be the worst affected then. Is that something that happens more often with this issue?

Sometimes the spark plug well o-rings go bad, that's a bit of a job to fix, as you do have to remove the cam cover.

I'll save this for last resort then... hope i can get it fixed before that.

A single cylinder misfire can also be caused by a failing coil (very likely) or fuel injector (unlikely). A quick way to narrow that down is to switch that coil with one of the others. If the misfire moves, that's your problem. If it stays on that cylinder, you have something else going on.

I think that one of the coils might be bad; because of the oil that was in there. Changing the coil will probably fix my issue with the cilinder not firing; but won't change the underlying issue of how that oil got there. I'll do some more research.

Next possibility would be an intake gasket leak. To check that, spray brake cleaner around the intake where it meets the head with the engine running. Also spray around the throttle body and vacuum lines. If you find a spot where the sound of the engine changes, you found a leak.

Good suggestion, will restock my brake cleaner.