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Jim Adney wrote: >On 22 Aug 2005 at 17:16, Constantino Tobio wrote: > > > >>My '03 Passat has a service interval of 40,000 miles for plug changes. >>OEM are those NGK iridium plugs with the two ground electrodes, and >>that's what she got put back in. >> >> > >Indium, really? That's the metal that melts at less than boiling water temp and >is softer than lead. How would indium be useful in a spark plug? > >Or are they platinum? > > > I believe you read it wrong, IRIdium not INdium Melting point of Iridium: 2410 ¡C (2683 ¡K, 4370 ¡F) Melting point of Platinum: 1774 ¡C (2047 ¡K, 3225 ¡F) Melting Point of Indium: 156.60¡C (429.75 K, 313.88¡F) So, as you could see, there would be some advantages to making plugs out of Iridium. Plugs made out of Indium would suck. :) Anyway, after looking it up, the OE plugs aren't the iridium-tipped ones. But here's a pic of what my Passat has OE: http://www.ngksparkplugs.com/images/tip/ngk33D.jpg Gapping them is kinda interesting. Funny thing- my plugs were OE NGK plugs (and they say so), but they have the VW-Audi logo on the porcelain. Surprised they weren't Bosch. Here's the NGK Iridium plugs: http://www.ngksparkplugs.com/products/cars_trucks_suvs/iridium.asp?nav=11410&country=US Whether there's any advantage of these over platinum plugs, I dunno. As for our T-3s, I imagine the standard Bosch plug is the best thing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~