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

Posted in Ignition Systems
  • 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