with that number i would pull a couple in the front just to see what they look like, i just like knowing whats in my engine.
i might take few of mine out next weekend, and i only have 65k miles on mine

I'd change. Thats pushing the given limit a bit and prolly near done. Whats your AVG MPG now?

I'll pull one up front because it'* easy. I am getting 18 or 19 mpg mixed driving.

yeah we have about the same MPG
but its good to check them, let me know how much fun you have doing the rear ones

Yep, mileage doesn't seem to have been affected yet then. Mine is in a 17.3 average and I can squeak out 23.7 on the highway/cruisecontrol/70-75MPH.

My inboard on my boat take gymnastics to change plugs, I waited 6 years to change them this spring. I pulled the front one every spring and this year it looked like they needed some Love. LOL. Probably do the same with the GXP as it approaches 100k

O common on guys its not really that bad, my OLD'* with the 3.8L was almost worse then the GXP.

Just changed the plugs with 68,000 on the clock and was glad I did! Not because they looked bad or was causing any problems. But when I started to take them out I thought the threads were going to come out with them or they would break off... they kinda grinded, scraped as they came out. It was the worst I experienced in 30 years and on 10 ten different vehicles, aluminum heads or otherwise! all that I would say is I hate to see what it would have been like at 100K mi Just take it slow and easy when your removing high mileage plugs. don't forget the anti-seize when you put them back in. Just a little will do it!

I would comment that I put in Bosch Platinum Plus 4 and they seem to be running great for the last 1K miles. Figured I'd try these because I ran them in my OLDs 3.8 for over 200K miles without any problems or decline in gas mileage.

i need help with my breaks everything has been changed and still i dont have any breaks someone help please

Don't forget to throw a dab of anti-sieze on the plug threads. You ARE threading in to aluminum.

My GXP is gonna get her new plugs time summer hits!!!

At about 80k, I was starting to get a rough idle on a cold and wet morning start. I discovered that the old plugs had a bit of crystallization building up. I installed Autolite Double Platinum APP104 plugs. So far so good!