Originally posted by SILVA BULLITT:
...I'm intrigued at your comment and would love to be enlightened by you on Iridium and Platinum? I'm not saying I'm doubting you Chris, just love to see your viewpoint in more detail!
Aloha 
The Iridium line from Denso is somewhat of a gimmick, not unlike Splitfire. I am sure they are decent plugs and will make a decent spark on regular cars.
However, on the Contour which uses a "non-normal" coil pack, every other plug is fired "backwards". If you look at the way the electrons flow, and you understand "molecular migration" you will see why any kind of plug that is not double platinum WILL fail in the rear bank of the Duratec and two out of four plugs on the Zetec (not sure which cyls).
No, I have not personally seen an Iridium fail on a Contour, but I seem to remember someone posting a picture of one. That electrode is fairly thin, so I would think it would fail faster.
Try to prove me wrong and run your car with the Iridiums for 5000 miles. Then, compare the front ones with the back ones. Who knows, "Iridium" might be some kind of magic metal?
