Spark plug question

having fun

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[MENTION=66389]BlackWorksInc[/MENTION] Or any toyota mechanic that does enough work on theses rides can answer this.
I'm at 120k on my 30k plug change. I have noticed that every time I have been changing my plugs, each time it seems that another plug would show a sticky golden color on the plugs. Started as just one, next time would be 3, ect. Now one looks like a blackening grease/oil film on itSame one is the only one that shows rusting color on it also. I haven't looked at a engine break down to see each component sections on the head area yet. Nor have I done a search for this. Go ahead and ban me for that one if you wish.

Just curious if it is a sign to worry about. No change in engine performance.

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