Oil on #2 plug only

[JMB340Challenger]

I've got oil on the threads and electrode of my #2 spark plug on a new motor.  All the other plugs look good. Only about 300 miles on it, is this normal or should I be concerned about rings not seating or bad valve seals? Thanks!

[Chryco Psycho]

could be an intake gasket problem too pulling oil up out of the lifter valley

[cudabob496]

valve cover gasket leak?

what is color of porcelin, compared to another plug?

[JMB340Challenger]

The plugs all looks the same except for the oil on #2. If it were a valve cover leak, shouldn't I see it leaking down the exterior of the head? Thanks!

[jhaag]

wouldn't think you would have oil on the threads from an internal source? I would suggest you swap plugs with another cylinder or replace it with new. After you put some more miles on it, check it again. Oil on the tip of the plug inside the combustion chamber, could indicate a problem, but unless you have other symptoms, I would run it some more and see what happens. 

[JMB340Challenger]

Ok thanks. I don't have any other symptoms. Car runs great for the most part! I am hoping it just need some more time to break the rings in as well.

[Chryco Psycho]

It is not normal to have one plug oiling up , something is not right , could be a ring installed upside down or broken , or a bad intake valve guide or seal . start with simple things & see if you can make the problem stop .

[JMB340Challenger]

Just had the the heads reworked, so I would imagine new valve seals were installed when the heads were reassembled. same with the rings; I built the engine and I know I put the rings on correctly. The intake gasket leak makes the most sense as I had the heads and intake milled a lot. Maybe my surfaces aren't mating perfectly.

[Chryco Psycho]

 That would be the first place I would look , if the bottom of the intaks is not sealed up the intake vacuum will pull in oil , you can retorque the intake as they get loose after a few heat cycles .

[JMB340Challenger]

I was able to torque the intake bolts considerable amount. I'll let you know how it turns out, Thanks Chryco!

[cudabob496]

Can't a leakdown test determine if valve seal?

[JMB340Challenger]

You're right cudabob, that's next if tightening the intake bolts doesn't help.

[JMB340Challenger]

Leak down test for rings though right?

[Chryco Psycho]

Leak down will test the seal of the cylinder , so rings , valve seats etc , there is no way a leak down will test a valve guide as the valve would be open to get pressure there

[cudabob496]

but you can do a leakdown test, to eliminate all other possibilities. If everything else
checks out, and your still buring oil as shown by the porcelin color of plug, then that
might suggest its a guide/seal.

also, if pull intake, valve with leaking guide should have a lotta black
gunk on top of vavle.