What is the approximate lifespan of iridium spark plugs?
2 Answers
Iridium spark plugs should be replaced every 60,000-80,000 kilometers. Under normal maintenance conditions, automobile spark plugs are typically replaced after traveling 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's recommended to follow the user manual. The following maintenance replacement standards can be referenced: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000-80,000 kilometers. Steps for replacing spark plugs: Open the engine hood, lift the plastic cover of the engine, and remove the high-voltage distribution wires. Mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. During removal, check for any external debris like leaves or dust and ensure thorough cleaning. 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 distribution wires according to the ignition sequence, then secure the cover plate.
I've been running an auto repair shop for fifteen years, and the actual lifespan of iridium spark plugs really depends on the specific vehicle model and driving habits. Manufacturers usually claim they can last 80,000 to 100,000 kilometers, but in reality, I've seen taxis with electrodes completely worn out at 60,000 km, and also serviced family cars that lasted 120,000 km before replacement. The key factor is your driving environment – frequent stop-and-go traffic and short trips can lead to carbon buildup that shortens their life. I generally advise customers to inspect the electrode gap around 70,000 km; if it exceeds 0.8 mm, consider replacement. Oh, and don't cheap out on no-name brands – last time a customer used counterfeit plugs that caused ignition issues after just 30,000 km.
