What are the differences between platinum, iridium, and iridium-platinum spark plugs?
2 Answers
The differences between iridium, platinum, 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 your engine. Below are the replacement intervals for spark plugs made of different materials: 1. Standard spark plugs: The lifespan of standard spark plugs is 20,000 kilometers. They can still be used beyond 20,000 kilometers, but it is not recommended to exceed 40,000 kilometers, as the ignition efficiency will decline, leading to reduced engine power. 2. Single platinum spark plugs: The lifespan of single platinum spark plugs is 50,000 to 80,000 kilometers. They require regular replacement. Performance degradation in single platinum spark plugs is indicated by normal anode wear, cathode erosion, and changes in the ignition gap. 3. Iridium spark plugs: The lifespan of iridium spark plugs is 50,000 kilometers. Performance degradation is characterized by cathode erosion, resulting in changes to the ignition gap and reduced stability. Regular replacement is recommended. 4. Iridium-platinum spark plugs: The lifespan of iridium-platinum spark plugs is 80,000 to 100,000 kilometers. Performance degradation typically manifests as aging of the ceramic insulator, leading to gas leakage, reduced cylinder pressure, insufficient power, increased fuel consumption, and poorer efficiency. Regular replacement is advised. 5. Double iridium spark plugs: The theoretical lifespan of double iridium spark plugs exceeds 100,000 kilometers. They are currently the highest-performing spark plugs, featuring rapid ignition, strong power output, and a long service life. Regular replacement is recommended.
When it comes to the differences between these three types of spark plugs, I have to start with durability. Platinum spark plugs have sturdy electrodes and can generally last around 60,000 kilometers, with good ignition stability, making them suitable for daily family cars and affordable in price. Iridium is different—its electrodes are finer, providing more precise ignition and a lifespan exceeding 100,000 kilometers, but it’s significantly more expensive. I personally use them in my compact car. Iridium-platinum combines the two: the center electrode uses iridium while the ground electrode uses platinum, balancing performance and durability. It ensures smoother engine response during long drives, making it ideal for those who prioritize a steady driving experience. In short, choosing a spark plug depends on your driving habits—go for iridium if you frequently drive on highways, opt for platinum to save money, and iridium-platinum is the versatile middle ground.
