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Q: oil in spark plug on 2006 Saab 9-7x

problem is oil is getting into one spark plug but no one has a clue from where
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Need to clarify this.
The oil gets to the spark plugs externally, around the porcelain insulator and connection, or gets into the combustion chamber and build up a deposit at the electrodes?

This is possibly oil leaking from the coil assembly in the Direct Ignition Cassette.
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