So Infiniti suggests that our NGK's are good until 100k miles. Here's a glance at what mine looked like at 78 k miles of relatively easy driving:

 

look like another leaking valve cover?

 

Definitely a leaky seal, which cylinder was that?

 

All six looked like that. However I changed out again after using sea foam 15k later, and not a drop of oil and they all looked decent for 15k miles. Now they are being changed again to 7re's for my turbo setup being installed.

 

so u never replaced the covers?

 

Nope. Like I said 15k miles later they ones replaced at 78k were clean as a whistle. They didn't look new still obviously, but had no traces of oil at all. I've done all my own work other than thermostat replacement and TP installation.

 

i dont get it lol

 

I'm just telling you facts. And showing you what I pulled out of my G at 78k.

 

Bahaha. You think yours were bad??

I pulled these out of my car. I have no idea if the PO ever bothered to change the spark plugs, or when for that matter.

 

Need to change mine soon.

 

I pulled mine @ 65k and had a oil on all of the plugs and a puddle of oil in cylinder 6

Those look clean compared to what I found. New NGKs and new OEM replaced valve covers are keeping things clean now

 

Wow you take the cake Mr Brett...run a little better after? How many miles was that pic at?

 

Much better.

Honestly, I have NO idea. The car had 199,000 miles on it when I bought it. I replaced the plugs at somewhere around 220,000 because the car was starting to have some serious hiccups at idle, and would bog almost to a stall at times.

I have documentation from the PO for most of the maintence done to the car when he owned it, but I can't seem to find any on spark plugs. Then again, I just skimmed the receipts and papers, so they might be in there somewhere... God, I hope he didn't go almost 200,000 miles without replacing them. I suppose my negligence is also partly to blame, though. I should have checked the plugs within the first 10,000 miles of owning the car.

 

The VQ guru's at Uprev recommend to change them every 30K miles or so until you've been tuned... our cars are not nice to plugs on the factory tune... Also they're shown that a fresh set of plugs is good for as much as 3 whp without any other changes...