41,400 miles on the original spark plugs...it was time they got changed. I have to say I'm VERY excited, as the new plugs seem to have completely eliminated the 6,000-7,000 RPM flat spot.

And yes...I apologize to all (and to my 8) for letting the stock plugs go this long.

Although, in my defense, I gave them a good cleaning at 30,000 miles.

 

What did you get for replacements?

 

Same as stock...from sparkplugs.com

 

Same here, sparkplugs.com rocks

I also got the Magnacore wires. Together, the new plugs and wires made a difference on the butt dyno.

I am somewhat of a maintenance freak, and only went 27K on mine. I also own a Miata, and it DEMANDS new plugs at 25K intervals

 

Also...the new plugs have added 40 miles per tank. Glad I finally took care of this.