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What Are the Differences Between Standard and Iridium Spark Plugs?

Model: (Various brands) Various
Part: Spark plugs

Video tutorial

Iridium spark plugs differ from standard ones mainly due to the much thinner centre electrode. Iridium is a precious metal with a high melting point and great wear resistance, allowing for the creation of very small electrodes.

This fine tip concentrates the spark at a precise point, promoting more efficient combustion and reducing carbon deposits. Standard spark plugs have a larger electrode, and the spark tends to jump at different points with less intensity.

Iridium spark plugs provide a more powerful and consistent spark, improving engine smoothness, reducing fuel consumption, and extending the lifespan of the plug. Do not expect a power increase just by changing the plugs, but rather an overall improvement in efficiency, especially under demanding driving conditions.

The choice depends on the type of engine and the manufacturer's recommendations.


Posted on 3 August 2026 by ScegliAuto


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by ScegliAuto

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