After How Many Miles Should U Change Your Spark Plugs Iridium Plugs Last 100k Miles

Posted in Ignition Systems | Asked on Jul 4, 2010

I often get different answers as to how many miles your spark plugs are good for. I keep hearing that the iridium plugs last 100k miles but this seems a lil hard to believe, how true is that claim?

There are 4 Answers for "After How Many Miles Should U Change Your Spark Plugs Iridium Plugs Last 100k Miles"

  1. David L says:

    40,000 to 50,000 miles. Before you buy Iridium plugs ask for the 100,000 mile warranty.

  2. Busitnjustin41 says:

    It depends on the motor and im not sure about iridium plugs but Platinum plugs have been around for years….I have a 1999 suburban that came with Platinum plugs, GM recommends replacing them at 100k……..I have 151,000 on them….no misfires, but they probably dont look too pretty : )

  3. Will says:

    The plugs will be fine the problem we find is a lot of the time the spark plug wont come out. I suggest to replace at 60k just for that reason, and have anti-seize on the threads and then dielectric grease to the spark plug boot to keep moisture and water out, also ads to boot removal next time.

  4. bill says:

    are they gaped properly thats all you need to know

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