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Oil on spark plug threads

  

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  • Hey Scotty I own a Toyota Corolla 2019 LE automatic at 33k miles. I decided to change the spark plugs for fun but then I noticed that the old plugs had a little oil on them. The oil didn’t go past the threads and plug 1 and 3 had more oil than 2 and 4 (from left to right). Should I worry about? If so what should be my next approach to this? Thank you. 

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Plan on changing your valve cover gaskets as it will get worse later.  Good thing you caught it....


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