How Long Can Iridium-Platinum Spark Plugs Last?
3 Answers
Iridium-platinum spark plugs can last for 80,000 to 100,000 kilometers before replacement. Under normal maintenance conditions, automotive spark plugs should be replaced after 40,000 to 60,000 kilometers of driving. However, this may vary depending on the brand and engine type, so it is recommended to follow the instructions in the user manual. The following standards can be referenced for maintenance and replacement: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Steps for replacing spark plugs: Open the engine hood, lift the plastic cover of the engine, and remove the high-voltage distributor wires. Mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris such as leaves or dust, and ensure they are thoroughly cleaned. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order, and then secure the cover plate.
I've been working in an auto repair shop for nearly a decade and have handled hundreds of iridium-platinum spark plug cases. These premium spark plugs are indeed more durable than standard nickel alloy ones, typically lasting 80,000 to 100,000 kilometers under normal driving conditions. Last month, I remember a Camry owner came in for replacement at 120,000 km, and the electrode wear was still minimal upon removal. However, actual lifespan depends on specific conditions - vehicles frequently driven in stop-and-go city traffic may require inspection at 70,000-80,000 km, as excessive engine carbon buildup can affect spark plug performance. Special care must be taken with electrode gap during installation - an apprentice once overtightened and cracked the ceramic insulator last time, rendering it useless. I recommend having technicians check electrode condition with a borescope during 60,000 km maintenance, rather than waiting until complete failure.
I've been driving for ride-hailing platforms for five years, covering 300 kilometers daily, so I know spark plug performance best. Iridium-platinum ones cost twice as much as regular ones but are truly durable – my Corolla didn't need replacement until 95,000 km. However, fuel quality matters. Once I refueled with substandard gasoline in another city and noticed unstable ignition at just 20,000 km. Now I strictly use 95-octane fuel combined with regular fuel system cleaner for carbon deposit removal. Winter cold starts particularly test spark plugs – mine still fires up at -15°C in one attempt. For regular family cars, I don't recommend pushing to 100,000 km. When you notice sluggish acceleration or sudden fuel consumption increase, get them checked. Replacing all four only costs about 500 yuan.
