So I was replacing my spark plugs today... couldnt remember the last time I did that so I felt it was time, and I got a pretty nasty suprise. All were ok, until the last cap I removed to get at the plug: the whole channel that the cap fits into was covered in oil.

Well at first I freaked out thinkin about worn cylinder walls or spent rings or a busted PCV valve. Then I began thinking. Since its only one, its probably not a PCV valve right? My best guess is that its a spark plug seal. I went out and got a valve cover gasket/spark plug seal kit, and I'm gonna put it in tomorrow. Anyone have any experience with this? Does my logic make sense?

A second question: The kit came with thick spark plug seals that go between the cylinder head and the spark plug channel on the valve cover, and smaller diameter spark plug tube seals. However, when taking off the valve cover tonight, only the thicker spark plug seals were present. Where do the tube seals go as they arent on the block now?