[iammarkus]

I had my stock plugs replaced with a set of NGK (1422) ILKR8E6 and noticed the originals looked pretty dirty with carbon buildup. There is only 9K on them, perhaps this is normal or the stock ones were crap. Also, I used a few brands of octane booster which could be the culprit. Any thought anyone has, please share.

 

[dac21]

I had my stock plugs replaced with a set of NGK (1422) ILKR8E6 and noticed the originals looked pretty dirty with carbon buildup. There is only 9K on them, perhaps this is normal or the stock ones were crap. Also, I used a few brands of octane booster which could be the culprit. Any thought anyone has, please share.

Sure does look dirty. Are you running a tune device that would benefit from 93+ octane? If not why use it? Probably placebo effect at best.

 

[miluardo]

I just changed mine out after 13000km and mine are similarly pretty dark but not as dark as yours.

I'll post a pick after lunch today.

 

[iammarkus]

Sure does look dirty. Are you running a tune device that would benefit from 93+ octane? If not why use it? Probably placebo effect at best.

Yes, I have a tuned device GAN. Also I have intake and exhaust mods as well. My tune will handle all the octane I can throw at it

 

[Purplehazeffc]

I would say you tuning device is running to rich.

https://www.championautoparts.com/P...-and-maintenance/how-to-read-spark-plugs.html

http://www.ngk-sparkplugs.jp/english/techinfo/troubleshooting/03/index.html

 

[Exeno]

Yes, I have a tuned device GAN. Also I have intake and exhaust mods as well. My tune will handle all the octane I can throw at it

Are those the OEM plugs? If so, you need to swap them. Any ECU tunes that are offered on our cars, also state the need for colder plugs. HKS M40XL/M45XL