>From my own experience (5000 turbo quattro), the 3 prong plugs idle
>accelerate smoother, and never wear out. I tried single electrode
>plugs for a while, and the engine just didn't run as well.
I too, tried a set of tri-electrode plugs in my 84 4000 Q, and found them
to be wonderful. Previous to them, I had platinums and they were good
also, but there was a noticeable dif with the tri's, and I could just turn
the key, and the car would spring to life instantly. With the plat's I had
to slightly pump the gas to get a consistant start.
The outfit that sold me the tri's said they would only be good for about
30K, but I think I put at least 50K on my set. I just reciently replaced
them with splitfires. Simular result, but not quite as good, and at about
$6 a shot. I'll go back to tri's next time, especially at ~$2. Where is
that mail order outfit?. ---JCG.