2001 Isuzu Axiom • 6 cylinder 2WD Automatic • 131 miles

Hello, I have an Isuzu Axiom, manufacture date is june/01.
When I went to replace spark-plugs, a 6" tube descended down through the head to the plug, and there was oil present, my socket was covered with oil. Also, the first and only plug I started to pull was beginning to seize after 3 turns.
I have never run into a problem like this. The plug is 6 inches deep and I am concerned about forcing it out.
Any suggestions?
April 7, 2011.

Oil is from failed "O" ring seal so need to replace valve cover gaskets. With covers off will be able spray plug threads with penitrate oil and carb cleaner. Carbon build up on plug threads is keeping from removal.

Apr 7, 2011.