Kind of a follow up to the earlier welded plug wires posted earlier in DIY guide [url”>http://www.greenflagauto.com/forum/Welded-Plug-Wires-t1876.html&pid=5348#entry5348. Ford has come out with a long bulletin and a couple special tools, on removing a broken plug. With 100K plug replacement this is going to become more of a problem. Fords contention is that the pieces of plug can be removed without removing the head; no other Major has commented on this, Ford is using a different plug that is about 3 inches of thread and metal in the head. Adding this length to a 100K replacement is bound to cause problems. I disagree with this, the head has to be removed to assure none of the particles enter the engine, if they do they can cause all sorts of problems some that may not show up for many miles. I haven’t tried it yet, but I will, doing a carbon treatment to the engine before plug removal. I believe will cure numerous problems caused by the longer plug.I don’t know but it looks to me that the 100K plug is costing more in the end with all the problems. I don’t see where it is a cost saving. Also as plugs wear the engine runs leaner thus more engine wear. Maybe these major manufactures are not as dumb as I think.