NGK LKR7AHX-S 96358 Ruthenium Spark Plugs

Description

NGK Ruthenium HX LKR7AHX-S (96358) Spark Plug — Specifications, Features & Applications

The NGK LKR7AHX-S, carried under stock number 96358, is part of NGK’s Ruthenium HX line — a high-ignitability upgrade plug engineered for modern V6 and larger four-cylinder engines that need a longer, projected-tip plug to reach deeper into the combustion chamber. Unlike shorter-reach Ruthenium HX plugs built for compact engines, the LKR7AHX-S uses a 12 mm thread with a long 26.5 mm reach, making it the correct-fitment plug across a wide range of Honda, Acura, Hyundai, Kia, and Jeep V6 and inline-four platforms.

Its Double Fine Electrode (DFE) design pairs a ruthenium-alloy center tip with an opposed fine-wire platinum ground electrode, concentrating spark energy so ignition stays reliable across rich and lean mixture swings — the kind of variation common in direct-injection engines, cold starts, and cylinder deactivation systems.

Technical Specifications

Key Features

Double Fine Electrode design for wider ignitability. The LKR7AHX-S opposes a ruthenium center electrode against a platinum-tipped ground electrode, concentrating spark energy tightly enough to fire cleanly across a wider air/fuel range — a real advantage in direct-injection V6 engines and cylinder-deactivation setups where mixture conditions shift constantly.

Projected, long-reach center electrode. The 26.5 mm reach and projected tip position the spark further into the combustion chamber than a standard plug, improving flame kernel development and helping the plug stay cleaner in engines prone to fouling at idle.

Ruthenium alloy center electrode. NGK’s patented ruthenium tip material resists electrical erosion and high-temperature wear better than platinum alone, keeping the gap stable and spark output consistent over the plug’s service life.

Platinum pin-type ground electrode. The fine-wire platinum ground tip supports a more complete fuel burn, translating into quicker throttle response, a smoother idle, and easier cold starts compared with a plug using a thick, plain ground strap.

Solid copper core. A 98%-pure copper core runs through the center electrode, drawing heat away from the tip efficiently and letting NGK build the plug into heat range 7 — a middle-of-the-road range suited to mixed city and highway driving in larger-displacement engines.

Corrosion-resistant, corrugated shell. Trivalent metal plating protects the shell against rust and thread seizing, while corrugated ribs on the insulator help prevent flashover, keeping spark energy directed at the gap instead of tracking down the outside of the plug.

Vehicles Using NGK LKR7AHX-S (96358)

This plug is factory-fit or a direct OE-spec replacement across roughly 200+ vehicle applications, concentrated in Honda/Acura V6 and four-cylinder engines along with several Hyundai-Kia and Stellantis platforms that share the same 12 mm long-reach spec. Commonly referenced fitments include:

Because fitment spans several V6 and four-cylinder engine families across multiple brands, exact application still varies by trim, model year, and engine code — even within the same nameplate. Always cross-check against the plug currently installed or your vehicle’s VIN before ordering, since Honda and Hyundai-Kia don’t always spec identical heat ranges across similarly sized engines.