NGK Iridium/Platinum Spark Plug Box of 4 (DILFR5A11)

The center electrode on these NGK spark plugs is tipped with iridium, a metal that's six times harder than platinum. This means it holds up better over time and helps maintain a consistent spark. NGK builds these plugs with a pure alumina silicate ceramic insulator, which is strong and helps transfer heat away from the plug tip. They also use trivalent metal plating on the threads, which helps prevent corrosion and makes them easier to install without seizing.

These are designed as direct replacements for vehicles originally equipped with OE DFE iridium alloy plugs. The pure copper core inside the insulator helps dissipate heat, preventing the plug from getting too hot. For vehicles with distributorless ignition systems, the ground electrode has a platinum fine wire tip. This helps ensure even wear and a more stable spark, which can lead to smoother engine operation and better fuel economy.

You'll get a box of four spark plugs, which is what most common V6 and V8 engines need. They're a solid option for many Infiniti, Nissan, and Suzuki vehicles, offering a good balance of performance and long life.