NGK Ruthenium HX Spark Plug Box of 4 (FR5AHX-E)

In this box, you'll get four NGK Ruthenium HX spark plugs, part number FR5AHX-E. These are designed for modern engines that need a strong spark to fire efficiently. They feature a patented Ruthenium alloy center electrode and a platinum fine wire ground electrode, which work together to create a more complete fuel burn. This can lead to a quicker throttle response, a smoother idle, and improved cold starts, especially in newer vehicles that demand high ignitability.

The design uses a 0.4mm Ruthenium alloy fine wire center electrode and a 0.8mm platinum fine wire ground electrode. This Double Fine Electrode (DFE) setup helps concentrate spark energy and ignites a wider range of air-fuel mixtures, making them work well in both rich and lean conditions. The pure alumina silicate ceramic insulator offers superior strength and better heat transfer, while the trivalent metal plating helps prevent corrosion and seizing. These plugs fit a range of vehicles, including models like the Dodge Avenger, Ford Thunderbird, and Lincoln LS.