Oil found in one spark plug hole? - Nissan Murano Forum
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post #1 of 15 Old 12-29-2012, 05:15 PM Thread Starter
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Oil found in one spark plug hole?

Guys in changing out my plugs on my wife's '05 MO and I've found a good amount of oil in in cylinder. How much? When I removed the plug socket, it was covered in oil. Car has always run perfectly - no codes. I'm concerned, any ideas??? :eek:

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'05 Black Murano
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post #2 of 15 Old 12-30-2012, 12:19 AM
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It is common for old valve cover gasket on bank 2 (on the firewall side) to leak oil into the plug holes on that side. Dealers routinely recommend replaceing the gasket when changing plugs for that exact reason.

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post #3 of 15 Old 12-30-2012, 04:04 AM
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^^^ thats what I figured it could have been. Had the same issue on my other car.
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post #4 of 15 Old 12-30-2012, 02:02 PM Thread Starter
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Thanks guys, I'm quite relieved................left alone will it cause any damage or should I ignore it? I must say that I don't remember seeing any leakage.

John Mc
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post #5 of 15 Old 12-30-2012, 02:47 PM
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If your in there, I would replace it. If your not smoking blue from the exhaust then it should only be a valve cover gasket issue and not a bad ring. Look closer to the top of the wall where the gasket sits.... You might see oil dripping down the wall. If its not major you might not see anything as you stated, unless you run your finger around and feel moisture from the oil.
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post #6 of 15 Old 12-30-2012, 02:55 PM
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If it's just a leaky gasket, it's not immediate priority.

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post #7 of 15 Old 12-30-2012, 05:18 PM
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My understanding on the spark plug seal is you need to replace the entire rocker cover because nissan does not sell just the plug seal. Its an assembly which cost around 2 bills. So if you wanna eliminate the oil getting into the plugs that is whats required to do. Its not the outer gasket causing it but the ones on the plug holes.
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post #8 of 15 Old 12-31-2012, 08:21 AM
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Your right, the outer portion of the gasket has nothing to do with it but the whole gasket kit must be purchased anyways. Or at least thats the case most of the time for most cars.
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post #9 of 15 Old 12-31-2012, 11:15 AM
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Try an nissan online part seller, the valve cover is around 150.00 each on the net. You could probably get both sides online for the same price as one side from the dealership.

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-I do all the work on it, while constantly begging her to trade it in
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K&N oil fillter 1008
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Shell Rotella T-6 5w-40 oil
BF Goodrich Longtrail T/A Tour tires
Royal Purple 75w-90 gear oil in the transfer-case and rear differential(Makes the Murano run smoother and the AWD more responsive)

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post #10 of 15 Old 12-31-2012, 11:55 AM Thread Starter
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Quote:
Originally Posted by srT4URBO View Post
If your in there, I would replace it. If your not smoking blue from the exhaust then it should only be a valve cover gasket issue and not a bad ring. Look closer to the top of the wall where the gasket sits.... You might see oil dripping down the wall. If its not major you might not see anything as you stated, unless you run your finger around and feel moisture from the oil.
Thanks, but I'm no longer in there. Since I saw no evidence of any oil in the conbustion chamber and made sure the plug seal was good, I just put it all back together and it runs beautifully afterwards. So, just watch for blue smoke from here and leave it alone??

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post #11 of 15 Old 12-31-2012, 02:09 PM
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Thanks, but I'm no longer in there. Since I saw no evidence of any oil in the conbustion chamber and made sure the plug seal was good, I just put it all back together and it runs beautifully afterwards. So, just watch for blue smoke from here and leave it alone??
Yes, I doubt a bad piston ring is your problem but thats what would cause the blue smoke from the exhaust as it burns the oil. Mostly noticeable on a cold startup or with a little rev of the throttle. If it is minimal and you put it all back together, I guess let it be for now. It definetly wont fix itself but might last a bit more depending on the seals condition.
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post #12 of 15 Old 01-01-2013, 12:01 PM Thread Starter
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Thanks for the response - this Murano creates no smoke whatsoever. I guess I'll just watch it and see what happens. Happy New Year.

John Mc
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post #13 of 15 Old 01-01-2013, 11:09 PM
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Oil in spark plug hole might at some point cause misfire which would be noticeable or even throw a code. So next time you are there may want to replace the gasket.


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post #14 of 15 Old 01-02-2013, 11:32 AM Thread Starter
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Will do and thanks to all who responded. Happy New Year!

John Mc
'05 Black Murano
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post #15 of 15 Old 01-02-2013, 02:19 PM
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Check out my post: How To -- Throttle Body, Spark Plugs, Firewall Valve Cover

Post 2 picture 7. You can read on but bottom line is that you have to lube up the gaskets before pressing them on the spark plug tubes. My bet is that they were not during original install. I was not having any misfiring issues even with oil in one of my spark plug tubes, but another forum member did.

Just replace the valve cover and you'll be fine. Will have to dig down to get to it though.

After 142K miles, my MO is history. Now sporting a loaded silver 2012 Ford Edge Limited with 20" wheels.
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