spark plugs

wow have you seen what variety of plugs are out there? I was looking for some for my E38, the manual reccomends NGK, I looked at Bosch and NGK but
there's platinum, platinum2, platinum+4, iridium, iridium extreme and iridium1x - does anyone know what's best or because the iridiums are $10 each (CAN) just get those?
Maurice
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Champion N9Y............I thought these fitted all cars.............they did when I was a lad.
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I put NGK's in my 520i years ago and it ran rough. Changed for Bosch and it was fine. Latest ones have 4 outside terminals coming up like arches and you don't need to gap them. They work well. They were $10 Australian each- probably $5 US.- everything is roughly half over there.
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Depends on the car. Some run great with fancy plugs, some run worse.
If the manual recommends NGK that's what I'd use absent overwhelming empirical evidence to the contrary.
--
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
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I used to second guess the engineers and try to do different things with my plugs. I've decided that the engineers know better than I, and now I select exact replacements for my plugs. I might go for Platinum, but I always select the single-electrode plugs if that is what my car came with.
I once bought a set ot plugs from the catalog, then went home and installed them. The car ran like shit, and took me hours to trouble shoot. I could barely drive it to the shop where they put it on the scope. It turns out that my factory plugs were something like 123C-xxs, and the replacement plugs were 123-xxs. The "C" was a very important character -- it meant that the plug was the "high output" type instead of the standard type. Now, I pull a plug, and drive a different car to go buy more just like it.

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