Originally Posted by
Daox
I've never personally had a problem with plugs seizing despite leaving them in for quite some time (over 100k). I suppose if you had doubts you could just loosen and retighten them every 30k or so.
I haven't either, but have heard of it
Originally Posted by
Daox
I'm not really arguing for iridiums as I use copper plugs too. I do see the benefit for most people though as they usually don't do their own service on cars.
Yes my calculation does not take into account labor. That being the case and the 100K interval is cheaper, but this engine is soooo simple to change the plugs, and most people on this forum are probably changing their own plugs already.