Which is Better: Iridium-Platinum or Double Iridium Spark Plugs?
2 Answers
Spark plugs made of iridium are better. Below is an introduction to the differences between platinum and iridium spark plugs: Different Materials: The biggest difference between iridium and platinum spark plugs lies in the precious metals they use. Precious metal spark plugs incorporate metals like iridium and platinum into the electrodes and improve the structure of the ignition end, resulting in better ignition performance and longer lifespan. Different Melting Points: Iridium has a high melting point, strength, and hardness. Its melting point is as high as 2454°C, with a hardness of 7. Its relative density is 22.56, and although it is brittle, it can be pressed into foil or drawn into fine wires at high temperatures. It has very stable chemical properties, is insoluble in water, and has high corrosion resistance. Platinum metal also has extremely strong corrosion resistance, is very stable at high temperatures, and has stable electrical properties. Its melting point is as high as 1773.5°C, with a hardness of 4-4.5. Therefore, the differences between iridium and platinum spark plugs lie in their hardness and melting points, but both have excellent corrosion resistance and remain stable at high temperatures.
I find this question quite interesting. As an average car owner who commutes daily, I've tried both types of spark plugs. Iridium-platinum spark plugs work perfectly fine for me - reasonably priced with good longevity, lasting 5-6 years without issues. Double-iridium plugs are more durable with quicker ignition response, especially making the engine run smoother at high speeds, but they come at a significantly higher price. From a cost-performance perspective, iridium-platinum is sufficient for city driving; but if you frequently take long trips or want extra driving pleasure, double-iridium is worth the investment. Though small, spark plugs affect overall performance. I recommend regular engine check-ups - don't wait until the car starts shaking to replace them, as this impacts both fuel efficiency and driving safety.
