NGK Laser Iridium/Platinum Spark Plug Box of 4 (LMAR9AI-8D)

The iridium-tipped center electrode on these NGK Laser Iridium spark plugs is about six times harder than platinum, offering excellent durability. This design choice is key for providing a consistently stable spark, which is crucial for efficient combustion in today's high-tech engines. The pure alumina silicate ceramic insulator not only offers superior strength but also helps with heat transfer, keeping the plug at optimal operating temperatures.

NGK builds these plugs with a 98 percent pure copper core that aids in heat removal, preventing overheating and ensuring reliable starts. For vehicles with distributorless ignition systems, you'll find a platinum pad on the ground electrode that promotes even wear. The trivalent metal plating provides good protection against corrosion and seizing, making installation and removal easier down the road. These are a solid option if your vehicle originally came with fine wire iridium alloy plugs.