Which spark plug is better iridium or platinum?

Related questions

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Tags

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2. #copper
3. #double
4. #plugs
5. #recommends
6. #harder
7. #since
8. #holds
9. #upgrade
10. #alloy
11. #nickel
12. #downgrade
13. #iridium
14. #either
15. #platinum
16. #sharp
17. #however
18. #owner
19. #money
20. #spark
21. #miles