What is so good about Iridium spark plugs?

Related questions

1. How often should you change spark plugs?
2. Is it OK to put anti seize on spark plugs?
3. What causes spark plugs to go bad fast?
4. Do you still need to gap spark plugs?
5. How do I make my spark plug gap smaller?
6. What happens if spark plug gap is wrong?
7. Do better spark plugs increase horsepower?
8. Should you use anti seize on NGK Spark Plugs?
9. How long will a spark plug last?
10. Which is better NGK or Denso Spark Plugs?

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22. #degrees