How often should car spark plugs be replaced? Generally speaking, there are 3 conditions:
1) Ordinary copper and nickel spark plugs ( or standard spark plugs) should be replaced every 20,000 to 30,000 kilometers.
2) Platinum and iridium spark plugs are suggested to change every 50,000 to 60,000 kilometers unless otherwise noted.
3) Double platinum and double iridium spark plugs to be repl
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