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A Complete Guide on When to Change Spark Plugs on Your Car

Model: (Various brands) Various
Part: Spark plugs

Video tutorial

Depending on the type of spark plug, there are different replacement intervals: Copper plugs (traditional): every 12,000 – 18,000 miles. Platinum plugs: every 37,000 – 50,000 miles.

Iridium plugs (the most durable): every 50,000 – 75,000 miles. Double platinum or iridium-platinum plugs: can last up to 93,000 miles.

Other factors that influence lifespan include fuel type (low-quality petrol can foul plugs more quickly); driving style: urban driving with frequent stop-and-go or short trips wears plugs out faster than motorway journeys. Engine condition: an engine that consumes oil or has air/fuel mixture issues reduces plug life.

Environmental conditions should also not be overlooked. Replace plugs when experiencing starting difficulties, loss of power, increased fuel consumption, poor engine performance, unusual noises, black smoke from the exhaust, or an illuminated engine light.

A visual inspection can tell you a lot: a good plug is beige or light grey; any other colour indicates damage. If you have a vehicle running on LPG or methane, plugs wear out more quickly, so if you replace them every 18,000 miles on a petrol car, do so at 15,500 miles.


Posted on 9 June 2026 by ScegliAuto


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by ScegliAuto

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