I simply removed my valve covers and put RTV around the plug seals. They won't fail again until I replace the motor at 200k if ever.

 

Does RTV really hold up?

 

It actually does.

I've used RTV only to seal parts of my lower intake manifold to the block on my Mustang. Holds up under boost too.

I could see RTV doing the job if the gap is small enough.

 

I have the same issue with my car. Stupid question but could this lead to OC issues? I was changing my spark plugs and then changed my oil and notice 2 quarts missing.

 

So did you remove the old seals? Or just add the RTV in addition to the existing seals?

 

Most likely added to the existing, since the gaskets can't be taken out.

In other news, since this seems to be such a common problem, I may just do a write up on it to help everyone else.

 

I first changed my plugs at 70k and found a pool of oil in the tube. I changed them today at 167 k and very little oil. There was some, but very little. No, I never did anything to fix the problem.

 

For anyone else looking, the company is Legion Fabrications in South Elmonte Cali.

Companies Powder Coating website here: http://www.legionpowdercoating.com/about-us/ (No link to their fabrication shop, I would assume that you could get the information through them).

From what I see on My350z they are having problems keeping covers in stock (people not returning cores). Basically plan to have your car down for 2 weeks or more to send yours off and get them back. Or go out on car-part.com, buy a pair of used ones for $80 and ship it to them.

Like I said, I may do a step by step write up to help people along.

 

How would I know if I have this problem without checking the actual sparkplug? i.e. rough idle

 

You won't know. My number 6 spark plug well was flooded with oil and the car drove fine.

 

If you don't fix the oil leak will it create other problems?

 

No, I just drove 90k miles since last plug change. At first change there was a pool all the way to the top of the plug. This time there was very little oil, less than 1/8 teaspoon worth. My coil pack works fine and no problems.

 

Here is something interesting. I replaced my valve covers with brand new Nissan valve covers. And replaced my spark plugs. Than about 5,000 miles later I get my car tuned and my tuner says my spark plugs are fouled. So I said ok no biggy I will just get 1 step colder plugs. So I change them a low and behold oil in spark plug 6 only. And yes we set the covers on straight. Wouldn't make sense only one cylinder have oil if the cover didn't seat right.


So now what is it that is causing that leak.

 

If it's not going to cause a problem i will not worry about it. Thanks

 

Faulty covers? You could bring it back, and with a little pushing you might get Nissan to replace it again and do it for you. Otherwise I would say some red RTV around the problem SP cylinder is the next best remedy.

As for G35CO, what CAN happen (not that it has happened to everyone) is the plug will foul and the car will start to miss on the affected cylinder(s). The oil will pool so much that your coil pack will, in essence, "drown" and the electrical signal will get lost in the oil and not go to the plug. The fix isn't an immediate thing that needs to be done, but for general piece of mind and as proper maintenance, I recommend replacing it.