What is the Difference Between Iridium and Platinum Spark Plugs?
3 Answers
Differences between iridium and platinum spark plugs: 1. Different hardness: Iridium spark plugs have higher hardness, better durability, and longer service life; platinum spark plugs have lower hardness. 2. Different ignition speeds: Iridium spark plugs ignite faster; platinum spark plugs ignite slower. 3. Different melting points: Under high-temperature conditions, iridium spark plugs can maintain more stable ignition performance, their center electrodes can be made thinner, require lower ignition voltage, and exhibit improved discharge performance; platinum spark plugs have a lower melting point than iridium, but under normal conditions, platinum spark plugs can also deliver excellent performance. Moreover, platinum spark plugs aim for stable performance, and under normal circumstances, most can last up to 100,000 kilometers.
The biggest differences between iridium and platinum spark plugs lie in their materials and performance. Iridium is harder and more durable, able to withstand high temperatures without wearing easily, with more precise and efficient ignition, typically lasting over 100,000 kilometers. Platinum is also good, offering stable ignition but being slightly softer, needing replacement every 60,000 to 80,000 kilometers. Personally, I prefer iridium more, especially since I drive a lot and pay attention to details—its shorter spark time means quicker engine starts and better fuel efficiency. However, iridium is more expensive; if you're on a tight budget, platinum will suffice. For frequent highway driving, iridium's durability appeals to me more, saving trips to the repair shop. For regular family cars, platinum is perfectly adequate—no need to overcomplicate things.
I've used both iridium and platinum spark plugs, and the difference is quite noticeable. Iridium lasts much longer; once installed, it can easily go 80,000 to 90,000 kilometers with minimal maintenance. Platinum, although cheaper, needs replacement sooner, degrading around 60,000 to 70,000 kilometers, causing misfires and annoying engine vibrations. If you're looking to save money, platinum is an option—I used it in my old car for two years without major issues, though fuel consumption was slightly higher. Now, with my new car, I've switched to iridium. It's more expensive but worth it in the long run. Changing spark plugs is simple enough to DIY—just don't wait until ignition problems arise, as engine damage could cost you more. In short, choose based on your driving frequency; for heavy drivers, iridium is the way to go.
