2013 Fiesta SE Hatch Manual Trans. 55,000 miles. I wanted to remove the spark plugs for inspection. They have never been loosened. was going to spray LPS1 greaseless penetrating oil a day or so before I removed the plugs. I am always conservative about removing plugs from aluminum heads. I began pulling the first wire off the first plug. It does not want to budge so I left it alone for now so I don't tear it up. any advice for removing spark plug wire that does not want to let loose of the plug? I see O'reilly has OEM motorcraft for $23.99. Can I trust that's not counterfit? If I damage the present set? Are there any sets that are better than OEM Motorcraft?