Spark Plug Calculator
Plan spark plug replacement: interval, number of plugs, cost estimate and a quick misfire symptom assistant.
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Plug life depends on material
Copper plugs last roughly 20,000–30,000 km, platinum 60,000–80,000 km and iridium up to 100,000 km. Modern iridium plugs are expensive but last far longer.
- Replace all plugs at the same time
- Use the correct gap for your engine
- Copper and iridium must not be mixed in the same engine set
- A worn plug shows up as rough idle and higher consumption
Misfire symptoms
A misfire (engine shakes, loss of power, check engine light with P0300–P0304 codes) can come from the plug, the coil, the injector or fuel quality. Read the OBD code before replacing anything.
FAQ
White electrode (too hot or lean), black sooty tip (rich or oiled), worn rounded electrode or a cracked ceramic insulator.
You can in an emergency, but for balanced running and even wear it is strongly recommended to replace the whole set.
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