thuxel

What I was originally concerned about was the corosion on the threads.

davesyo

Just because the manual says to change the plugs at 100,000 I would never ever leave them in there that long .I would change mine at 40,000 or so

157dB

40K sounds about right.
I would at least remove them and nickel anti-seize them about then.

tx_zstang

When you put the plugs back in, put a small amount of antiseize on the threads; that will help them go in easier and can get them out later easier.

As far as interval, IT DEPENDS ON YOUR SETUP!!! The stock plugs are supposed to last quite a while; HOWEVER, if you are running a custom tune and maybe even a CAI, you might need to check or change your plugs sooner.
After less than 30K miles, half of my plugs' were essentially wore out (electrodes worn down to much less than when new, on some plugs more than others). I started noticing some occasioanal missing out, checked/changed the plugs and it solved it.
(That was when I still had a CAI and was N/A, and running stock plugs).

48prerunner

[QUOTE=tx_zstang;5788514]When you put the plugs back in, put a small amount of antiseize on the threads; that will help them go in easier and can get them out later easier.



YES on the antiseize especially with the aluminum heads on our cars. If its not on there who ever gets stuck doing the next plug change might not get them out! or may take part of the head with them.