Tips:

- Use a neversieze compound on the spark plug threads to prevent any potential galling that is common in threaded aluminum holes.

- Butter the inside of the spark plug boot with silicone grease (dielectric grease or Sil-glyde) to prevent the boot from adhering to the spark plug ceramic.

Both these actions will ease service the next time spark plugs are changed.

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95 E320 Cabriolet, 169K