NGK 92725 Spark Plug

NGK Laser Iridium Spark Plug for OE Fitment

The NGK Laser Iridium High Ignitability Spark Plug, part number 92725, is built for Mercedes-Benz and INFINITI applications that call for precise ignition performance and OE-style replacement. It is engineered around the factory high-ignitability design used in select Mercedes-Benz Metris, Sprinter 1500, Sprinter 2500, GLA250, GLC300, C300, CLA250, and related models.

NGK is a long-standing OE spark plug supplier in North America, with manufacturing experience across domestic and import vehicle applications. The 92725 spark plug follows that OE-focused approach for drivers who need the correct heat range, gap, and ignition characteristics for the listed vehicles.

• Laser iridium construction for stable ignition performance
• High ignitability design for OE-style combustion control
• Specially indexed plug for listed Mercedes-Benz applications
• Factory-recommended service intervals noted for supported vehicles
• Direct replacement reference: NGK SILZKFR8H7S
• This part cross-references Eastern Catalytic 92725 for the same application

Detailed Product Information

NGK 92725 is a Laser Iridium High Ignitability Spark Plug intended for vehicles that require the original high-ignitability plug specification. It is listed for 2013-2023 Mercedes-Benz applications including Metris, Sprinter 1500, Sprinter 2500, GLA250, GLC350e, SLC300, B250, CLA250, E300, GLC300, C300, C350e, and SLK300, plus 2016-2019 INFINITI Q50, 2017-2019 INFINITI QX30, and 2017-2018 INFINITI Q60. For many of these vehicles, the OE notes specify a 0.028 in. gap and advise against alternative plug types.

Common Issues This Part Addresses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire conditions tied to incorrect plug specification
• Loss of throttle response from degraded spark quality
• Service replacement needs at factory-recommended intervals

Installation Notes and Tips

Verify the exact engine application before ordering, especially on Mercedes-Benz models that require a specially indexed high-ignitability plug. Confirm the specified gap and follow the vehicle service information for torque and replacement interval guidance. For listed applications such as Mercedes-Benz Metris, Sprinter 1500, and Sprinter 2500, use the OE-style plug specification rather than an alternative design.

Quality Assurance

NGK is recognized as a major OE spark plug supplier with decades of automotive manufacturing experience. Part number 92725 is built to support the original equipment standards called out for the listed Mercedes-Benz and INFINITI applications.