What is the difference between iridium and platinum spark plugs in cars?

[Boromir]

The differences between iridium and platinum spark plugs in cars are: 1. Different melting points: Iridium has a higher melting point than platinum, allowing iridium spark plugs to maintain stable ignition under continuous high-temperature engine operation, making them more focused on stability; 2. Different hardness: Iridium spark plugs are harder than platinum ones, offering better durability, although platinum spark plugs can still last up to 100,000 kilometers under normal conditions. Iridium spark plugs outperform platinum spark plugs in many aspects, but they are more expensive, making platinum spark plugs more cost-effective.