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Which reason makes long life plugs harder to remove?

  • A.Their material
  • B.Their greater reach, which places more of the thread within the head and therefore increases the area that may seize
  • C.Corrosion of the thread over the extended interval
  • D.The higher torque to which they are tightened, which is required in order to seal the combustion pressure reliably

Answer: C

A hundred thousand kilometres of heat cycling bonds the thread to the head, particularly in aluminium. Reach genuinely affects how much thread is exposed to combustion, which makes the last option a real contributing factor. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once.

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