How Often Should Original Spark Plugs Be Replaced?
2 Answers
Under normal maintenance conditions, automotive spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow 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 ignition wires. Mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for 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 ignition wires according to the firing order, and then secure the cover plate.
I've been repairing cars for almost ten years, and the replacement interval for original spark plugs is really crucial. Generally speaking, most vehicle models recommend replacement between 30,000 to 60,000 kilometers, but it depends on your car type. If it's a copper-core spark plug, it needs replacement around 30,000 kilometers, while platinum or iridium ones can last up to 80,000 or even 100,000 kilometers. You should observe frequently—if the car jerks when starting or accelerates slower, it might be due to aging spark plugs. Remember to check the manual regularly and don’t fall for the dealership’s early replacement pitches; it saves money and is eco-friendly. I also suggest having the technician test the resistance value during each maintenance—if it's normal, you can keep using it. If you don’t replace them, engine carbon buildup will increase, fuel consumption will spike, and repairs will end up costing more. Overall, diligent maintenance helps your car run longer with fewer issues.
