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Pulled these out of a 2012 Mazda 3 skyactiv with 80k miles. Can

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File: 20170617_153230-1.jpg (1MB, 2168x2149px) Image search: [Google]
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Pulled these out of a 2012 Mazda 3 skyactiv with 80k miles. Can anyone explain why one of the spark plugs have a little oil and looks black on the threads? The other three look good imo
>>
>>17388178
Maybe valve cover seal is leaking near that plug and dribbling some oil on it.

Tips look OK, so oil is probably not coming up from cylinder.
>>
Leaky valve cover gasket. No big deal.
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>>17388238
>valve cover
>>17388241
>valve cover

LIFTER LID*
>>
Dont worry about it, sand the points down and toss em back in
>>
File: 1497491855716.jpg (16KB, 283x414px) Image search: [Google]
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>>17388178
>put sbargblug in anus
>>
If it was a valve cover seal wouldnt leak on top of the spark plug not the bottom? Or does it make a difference?
Thread posts: 7
Thread images: 2


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