What the heck is this?
 

Lately I thought I felt a slight skip in my car at idle. I decided to check a few plugs just to see how they looked. I checked 1, 3, 5 and 4 because they're the "easy" ones to get to. This is number 5:

http://i158.photobucket.com/albums/t...20plugs/5a.jpg

http://i158.photobucket.com/albums/t...20plugs/5b.jpg

http://i158.photobucket.com/albums/t...20plugs/5c.jpg

Any thoughts on what might be causing that? I suspect my car has bad valve seals due to the oil consumption, and I've seen pictures of plugs that had deposits like that and it was caused by oil. Number 1 looked like that but not as bad, number 3 looked fine, as did number 4:

http://i158.photobucket.com/albums/t...20plugs/4a.jpg

I've got some brand new NGKs ready to go in but I would love to resolve this issue before I install them.

Looks like fkn barnicles ...
Looks like valve seals (could be wrong though)

you adding anything to your oil or fuel?

Not lately, was going to put some Marvel in the fuel next fillup

wouldnt matter , it would be on all 8.

Ive never seen that , and for you thats not good. lol.........maybe long term seep from a headgasket on that cylinder?

I don't think it's a headgasket, the car is never down a drop of coolant.

Here's some pics I found, descriptions said the plugs were from engines that burned oil

http://image.superstreetonline.com/f...urning_oil.jpg

http://www.engines1.com/images/blogp...uled_plugs.jpg

And here's the pic from the back of the Haynes manual:

http://forums.themustangsource.com/a...4100345224.jpg

The engine goes through a quart every 1,000-1,200 miles so it would make sense. Since it still runs strong I suspect it's valve seals, but changing them means having to reset the preload on the rockers, not sure I am up for trying that myself.

Stock rockers?

Yup

I've done mine, lol.

Pretty easy, just takes some time and gotta pay close attention, save the 6 pack for after lol

Time for an LS swap.