About to throw in a set of these. Been having misfires, mostly after off road very wet driving and subsequent high pressure undercarriage washing. I know that is the cause, but it had me checking the conditions of my plugs. I pulled out #8 to make sure it wasn't steam cleaned (it was throwing the most codes) and all is good compared to others. Only having this truck for few thousand miles I haven't changed the plugs yet. It has some cheap base model AC Delcos in it that look kinda worn. I read a lot of good reviews about these and am going to give them a try. They are gapped right at 0.040 (rave specs) according to gap checker. Got a set of 8 for about $25 at advance auto, so good price too. Anyone ever use these? I'll report back on how they perform. Also, I already have blue STI wires.

Buy Denso PK16TT Platinum TT Spark Plug 4503 at Advance Auto Parts

 

Stay with 8 mm silicone wires like the STI's or Magnecor's.
If you want to try a different plug, consider running a set of E3, #48 spark plugs. A number of my friend have switched over and we all agree they do generate more low end torque and the MPG increase is good also.

 

I've heard this as well, but also heard the ceramic material wears out fast or cracks. Many people have reported failures in 30k miles or less. I will be replacing mine every 30k now anyway, so I just went with a cheaper plug with great reviews across the board. I strongly considered the E3s though.

 

They are guaranteed for 5 years with either a free replacement set or your money back, can't beat that. Also, any of the newer high end plugs will give you 80,000 to 100,000 miles so replacing them every 30,000 is not necessary.

 

Yea, but them causing subsidiary damage is my worry, not the 5-10 bucks to replace them. I know it's not necessary, but it gives me peace of mind. Worth the $25. Plus, I could probably argue that the degradation that occurs on them from 30k to 80-100k miles and its effect on mpg is worth the $25 early change.

 

Installed them and took a short drive. Runs very well. Pleased so far. Next fill up I will see if gas mileage improved

 

I can tell you right now that little "bump" on the ground electrode will be worn off in 10,000 miles and your gap will be wrong once it does.
I ran a set of AutoLite Iridiums that were that way, they were junk in a year.

I have ran the E3's in my truck and my truck hated them.
However I swear by those plugs in everything else, they last forever and decrease fuel consumption, in my chainsaw before the E3 I could cut wood for maybe 20min before running out of gas, after the E3 I can go 30 min before running out of gas.
Same plug in my lawnmower for 6yrs, still good, snowblower, 10yrs, still good.
Just installed a set into my mothers '08 Escape, its still a POS car, but it runs great.
They are going into the wifes Sedona too.

 

Well shoot, It will take me 2 years to get 10k miles, so I'll just deal with it then. Spark plugs seem more of a preference/argument than oil.