What is the difference between iridium and platinum spark plugs?
2 Answers
The differences between iridium and platinum spark plugs are reflected in the following aspects: 1. In terms of performance: Iridium spark plugs perform better than platinum ones. Since iridium has a higher melting point than platinum, it can be made finer, providing stronger ignition with lower required voltage, reducing misfire rates, and offering excellent chemical corrosion resistance. 2. In terms of stability: Iridium spark plugs are more pressure-resistant and stable than platinum ones. Typically, standard resistor spark plugs last 20,000 kilometers, platinum spark plugs last 40,000 kilometers, while iridium spark plugs can last between 60,000 to 80,000 kilometers.
Last time I changed spark plugs, I was really torn between iridium and platinum. The main differences lie in the material and durability. Iridium plugs use iridium metal for the electrode, which is harder and more heat-resistant, typically lasting 80,000 to 100,000 km. They provide faster and more precise ignition, making engine starts much smoother. However, they are quite expensive upfront, but considering fewer replacements needed, they actually save money in the long run. Platinum spark plugs have a slightly shorter lifespan, around 60,000 to 80,000 km, with decent ignition performance, though the softer electrode wears faster under high temperatures. They're cheaper than iridium but still significantly pricier than standard copper ones. I went with iridium for my family car – even saw a slight fuel economy improvement on long trips. If you frequently drive highways or own an older car needing longevity, iridium's the way to go. Otherwise, platinum works fine for daily use. Always check your vehicle manual when changing spark plugs to avoid mistakes.
