what is wrong with my cylinder?

See spark plug images. 5 of the six plugs look like the 1st two images below

https://imgur.com/gallery/HWxojWN
and
https://imgur.com/gallery/HNsRAML

questionable plug is in these three images:
https://imgur.com/gallery/4cxiIIA
and
https://imgur.com/gallery/5hdPUH9
and
after removal and replacement, then sat for 24 hours(was not driven):
https://imgur.com/gallery/0wPFTvK

See the electrode crud and oil on threads. It looks like even more oil after removal and replacement. One plug only. Is there issue with that cylendar?

2007 Engine 2gr fe with 190k miles

I just saw this post, only 6 mos late :(

Ever figure it out?

Nope

Something does not look right with that cylinder.
If you haven't already, do a compression and/or leak down test on all the cylinders.
If the results for that cylinder are different than the others (like low compression, etc) then there is a problem.

3 hours labor to get to rear plugs, then car cant be started until it's all put back together. Which is another 3 hours. If it's a valve or rings, it'll have to wait. It does run good and got good acceleration.

I posted this to several forums and most ppl didn't think a problem.

I posted this to several forums and most ppl didn't think a problem.

It may not be in the long run, but a simple test or 2 may put your mind at ease, or let you know of a problem that would probably just get worse.

That's a lot of time to do some plugs :eek:
A bit easier on my 22R 4 cyl. :grinyes:

Do you only difference I can see is the plug in question is a bit wet.

If it runs and drives fine and I would agree with everyone else so nothing to worry about… But, at most paranoid:
Are you losing any coolant? After inspecting your motor oil, does it look muddy? Does the exhaust smell like antifreeze? Any bubbles in the coolant reservoir?

These would be signs of a possible bad head gasket.