The problem with these plugs is the design. The threads go past the threaded part of the head and allow combustion byproducts to build up and interfere with removal. They are also of a poor design that is prone to breakage. Best advice if you are going to try them yourself is do not force anything. If one starts to bind, turn it back in and work it back and forth a few times until it loosens up. Once you break one, you will probably be going to the dealer anyways.
Personally, I ALWAYS use a thread lubricant on spark plugs that go into an aluminum head. You have two different metals in contact with each other, and the plug is prone to binding or galling in the aluminum threads. I have on occasion seen the threads come out with the plug. Better safe than sorry.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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