From what I have read, looks pretty normal for rotary plugs. The black has me a tad worried, but I plan to pull and inspect them after a couple oil changes unless things get funky. As for now the car is noticeably more quite and idles smoother. Makes a more raspy sound with high RPM and WOT. Just seems a bit spunkier in general. Worth the $100 for the plugs!

 

I checked a original leading plug at 28k miles, but it had no black on it an about 10% of the tan that you have.

I did put the BHR ign on at 23k miles, so the plugs are still alive.

In fact with the stronger spark of the BHR, IMO that the plug gap can wear farther which means run longer.

I run an auto 6spd which revs lower and less so I plan to replace at 50k miles.

You got all there was out of these plugs, so now go put on some coils to keep the carbon at bay.

 

It looks damaged...lol

 

I'll keep an eye on it. As long as it runs strong I'm not to worried. I have a lot of warranty left. Coils are planned for later down the road.

 

Those look fine....driven a bit harder they would be cleaner looking

 

I drive it pretty hard. Previous owned, not so sure. I got the car with 27K on it. Drove it to 34K so far. Who knows how much build up I've blown off. lol

 

Very very cool, and thanks for the lesson! I love your unique ink!

 

LOL, we had a spammer with the very same username on my gaming forums. Signed up to the site and was silent for a couple months then started spamming away. Damn bots.

 

Pretty much exactly what my plugs looked like when I changed them at 38k.

 

Mine at about 30k had very very light brown stuff on them, mostly ashy gray. They did however have the chunks of carbon on them like these.