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Reading Spark Plugs - Oil (?) On Threads

Discussion in 'General 4Runner Talk' started by 4R777, Dec 25, 2023.

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Dec 25, 2023 at 4:35 PM

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4R777 [OP] New Member

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Took out three spark plugs and all three looked like this. Very clean from the top of the plug down to the threads. But the threads look like they have a bunch of oil on them. Inspected the coils and they all look new.

Thoughts?

4R777, Dec 25, 2023

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Dec 25, 2023 at 4:45 PM

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3JOH22A Toyota Gigolo

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^Were the spark plug tubes clean? If so, then no problem.

Those aren't OEM 4th gen plugs. If the spark plug tubes are clean, the previous owner may have oiled the threads on installation.

Last edited: Dec 25, 2023

3JOH22A, Dec 25, 2023

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4R777[QUOTED][OP] and 2ndGen22re like this.

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