NGK IX Iridium Spark Plug Box of 4 (LKR7AIX)

The fine iridium center electrode in these NGK IX spark plugs has a melting point six times harder than platinum, making it ideal for today's higher-temperature engines. This durable construction helps ensure a consistent spark, which translates to better acceleration and improved fuel efficiency. These plugs are a solid option for upgrading from standard nickel alloy plugs or for use in modified applications.

NGK uses a trivalent metal plating on the exterior of the plug, which helps prevent corrosion and makes them easier to remove down the road. The tapered cut ground electrode is also designed to improve starting, idling, and throttle response. This set includes four spark plugs, fitting a range of vehicles including many Mercedes-Benz C-Class, E-Class, and Mitsubishi Outlander models.