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Why do they cost $30+ each? what is so special about these plugs?
 

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32000 mile replacement.

NGK iridium spark plugs currently represent the highest-quality technological solution. They feature an iridium-alloy on the middle electrode welded on in a special process using laser. One of the world’s hardest metals, the precious metal iridium starts melting at a temperature of 2450°C and is therefore very resistant to spark erosion. By using it, the service life is doubled on average in comparison to standard nickel spark plugs.
 

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Good to know. I was not looking forward to changing them.
 
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