Moving this post to a more appropriate sub-forum.

Just recently picked up an 07 g35x, coming away from an 03 350z. For those who did/do not know, G35's pre HR motor have notoriously known to have problems with oil seeping from inside the valve cover into the tubes isolating sparkplugs from the rest of the head and oiling system. Some worse than others, primarily cyl 6, and possibly cyl 5 are affected. Coil packs can become increasingly flooded with oil overtime potentially creating poor conductivity between coil and plug resulting in poor spark performance up to a non firing cylinder. I've searched around, found countless threads on this issue be it this website, alongside Nico, and others... and it is a very well documented issue for V35's, but I couldn't find anyone posting issues specifically stating their v36 with this issue, I understand most of us also do not have enough miles on the clock, to warrant a spark plug change, although some may be close! rather than assuming and tearing apart my new purchase right away, is this common knowledge to anyone that the hr is not affected by the poor design of the de valve cover and grommets? Am I rid the oil submerged coil pack? Anyone have enough mileage on their 3.5 v36 clock, and did their own sparkplugs that could contribute?

 

How can we check if there is an oil in the spark plugs tubes ? Do we have to take the plugs out and check the tubes ? In fact .. I noticed some oil spillage on top of my engine just around the plug's tubes roofing/covers ( right underneath the engine cover ).

 

You don't have to take the plugs out; however, you would need to take the coil packs off, then you would be able to see down to where the sparkplugs are, the potential problem would be that oil would be pooled around / on the spark plugs themselves. Traditionally the spark plug (facing the car from the front bumper) the furthest spark plug away from you (closest to firewall) passenger side. It is possible that others are bad as well.

 

I don't think the HR had these issues.

 

sounds good, thanks for the info.

 

^ Not that i know of either. Did have issues on my A33 as well, but not nearly as bad as others.

 

From what I know the reason the HR is so much better is because they took all these DE issues including oil consumption and fixed it. I have heard almost no major issues with the HR motors, they were made really well.