What is the Difference Between Iridium Spark Plugs and Iridium-Platinum Spark Plugs?
2 Answers
The differences between platinum spark plugs and iridium-platinum spark plugs lie in their service life, fuel efficiency, and power enhancement. Iridium-platinum spark plugs outperform platinum spark plugs in terms of performance. The better the material of the spark plug, the longer its service life. You can choose the material and model of the spark plug based on the engine. Below are the replacement cycles for spark plugs made of different materials: 1. The lifespan of standard spark plugs is 20,000 kilometers. They can still be used beyond 20,000 kilometers, but it is recommended not to exceed 40,000 kilometers. Otherwise, the ignition efficiency will decline, leading to a decrease in engine power. 2. The lifespan of single-platinum spark plugs is 50,000 to 80,000 kilometers. They require regular replacement. Performance degradation of single-platinum spark plugs manifests as normal anode conditions, cathode erosion, and changes in the ignition gap. 3. The lifespan of iridium spark plugs is 50,000 kilometers. Performance degradation is indicated by cathode erosion, which causes changes in the ignition gap and reduced stability. Regular replacement is recommended. 4. The lifespan of iridium-platinum spark plugs is 80,000 to 100,000 kilometers. Performance degradation typically appears as aging of the ceramic insulation, leading to air leakage, reduced cylinder pressure, insufficient power, increased fuel consumption, and poorer efficiency. Regular replacement is advised. 5. The theoretical lifespan of double-iridium spark plugs exceeds 100,000 kilometers. They are currently the best-performing spark plugs, featuring rapid ignition, strong power, and a long service life. Regular replacement is recommended.
I've been driving for over a decade and often change spark plugs myself. The main differences between iridium and iridium-platinum plugs lie in materials and lifespan. Iridium plugs use pure iridium for the center electrode, providing quick ignition and fast starts, making them suitable for general city driving with a lifespan of about 60,000-80,000 km. However, they wear out faster and are prone to carbon buildup. Iridium-platinum plugs are more advanced, featuring a platinum coating on the ground electrode to reduce corrosion and extend lifespan to over 100,000 km. The engine also runs smoother, especially noticeable during long-distance or high-speed driving. The downside is they cost twice as much, so I recommend them for drivers with higher budgets or those who frequently drive on highways; for daily use, iridium plugs are cost-effective enough—no need to overspend. The key is driving habits, and cleaning the electrodes during replacement also affects performance.
