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Spark plugs do not undo themselves. They work loose because whoever fitted them did not torque them up properly.
The dirt around your loose plug is combustion products leaking past the plug.
Tighten them all up to the correct torque and don't worry about it.
Mark
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1991 944 S2 (no more, sold it, gone to a good home)
2003 Infiniti G35 Coupe, 280hp, Black
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