advice on long life plugs?

[scott thomas]

I'm looking for longer life plugs for my 200q 10v. The dtcs are
showing some wear after 4 months of service. Just a side note: I run
only 1.6 bar, but I also do alot of miles, like NYC to Des Moines.

What are my alternatives? Here's my list, fill in what I left out:

1. Bosch Platinum +4 (for the sake of not going too expensive, but
don't know if they suck like the singles electrodes)
2. W7dpo platinum with the side electrode facing the side of the
center (expensive, who sells them for the least?)
3. One of those new Iridium spark plugs by NGK or Denso (don't know
anything about them)
4. Local auto parts store Platinums, like Autolite, with larger
electrodes, or double platinum (hear years back that some listers
used these successfully)

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