NGK 93420 Spark Plug

NGK Ruthenium HX Spark Plug 93420

NGK 93420 is a Ruthenium HX High Ignitability spark plug built for direct-fit service in a wide range of import and domestic applications. It uses a ruthenium center electrode tip, copper core construction, and a 0.032 in pre-gap to support consistent ignition performance in vehicles such as Dodge Durango, Ram 1500, Subaru WRX, and Volvo XC60 applications.

Key Features

• Ruthenium center electrode tip material for stable spark delivery
• High Ignitability projected square platinum ground electrode design
• Copper core center and ground electrodes
• 0.032 in pre-gap specification
• 5,000 ohm resistance
• 14 mm thread diameter, 26.5 mm reach, flat seat
• 5/8 in hex size with non-removable nut terminal
• NGK part number 93420, manufacturer part number LFR6BHX

Product Details

The NGK Ruthenium HX High Ignitability Spark Plug line is engineered around OE-style fitment and ignition consistency. NGK’s long history as an OE supplier shows in the plug’s material selection and dimensional accuracy, including the copper core design, ruthenium tip, and heat range 6 construction. This part number, 93420, is used across many vehicles that call for precise gap settings, including Subaru Legacy and Outback models, as well as Volvo S60, V60, XC60, XC70, and S80 applications.

This part cross-references NGK 93420 for the same application.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions tied to incorrect plug gap or electrode wear
• Reduced throttle response from degraded spark delivery
• Service replacement needs on vehicles calling for NGK LFR6BHX / 93420

Installation Notes

Verify the vehicle-specific gap before installation. Fitment notes call for 0.032 in on many Dodge, Ram, and Mercedes-Benz applications, 0.030 in on several Subaru and Land Rover applications, 0.028 in on select Volvo and Saab applications, 0.040 in on several Volvo and Hyundai applications, and 0.044 in on certain Subaru and Suzuki applications. Use the exact fitment listing for your year, make, and model before installing NGK 93420.

• Fits 2023-2025 Dodge Durango, N/A; gap 0.032 in
• Fits 2022-2024 Ram 1500, N/A; gap 0.032 in
• Fits 2021-2023 Dodge Charger, N/A; gap 0.032 in
• Fits 2018-2021 Jeep Grand Cherokee, N/A; dual plug; requires 16 plugs with a gap of 0.032 in
• Fits 2010-2019 Subaru Legacy, N/A; adjust spark plug gap to 0.044 in
• Fits 2012-2016 Volvo S60, N/A; set spark plug gap to 0.040 in
• Fits 2004-2014 Subaru Impreza, N/A; fitment requires a 0.030 in gap
• Fits 2007-2013 Volvo C30, N/A; set spark plug gap to 0.028 in

Quality Assurance

NGK is a major OE spark plug supplier in North America and manufactures ignition components to original equipment standards for durability and operational performance. Part number 93420 reflects that OE-focused approach for service replacement across a broad range of applications.