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Difference Between Iridium Spark Plugs and Standard Spark Plugs

Model: (Various brands) Various
Part: Spark plugs

Video tutorial

In this video, you will see the difference between iridium spark plugs and standard spark plugs. Aesthetically, the electrode on the iridium plug is significantly smaller, and it should not be brushed or tampered with in any way. Being smaller facilitates the propagation of the spark.

Another quality of iridium is that it has a very low percentage of misfires compared to standard plugs, allowing the engine to rev up more easily. The YouTuber demonstrates the difference on a spark plug tester, where you can see, especially at maximum revs, the perfect sealing of the iridium plug compared to the standard plug.


Updated on 10 September 2026 by ScegliAuto


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by ScegliAuto

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