NGK 90654 Spark Plug

NGK Laser Iridium Spark Plug 90654

NGK 90654 is a Laser Iridium High Ignitability spark plug built for select Mercedes-Benz and INFINITI applications that call for an OE-style, specially indexed plug. It uses an iridium center electrode, a copper core, and a 0.028" pre-gap to support consistent ignition performance in the specified vehicles.

Key Features

• Laser Iridium High Ignitability design for OE-matched ignition requirements
• Iridium center electrode tip with copper core construction
• Square platinum high-ignitability ground electrode tip design
• 0.028" pre-gap for the listed applications
• 1000 ohm resistance and flat seat design
• 14 mm hex, 12.00 mm thread diameter, 26.5 mm reach
• NGK part number 90654; manufacturer part number SILZKFR8E7S

Product Details

This NGK Laser Iridium High Ignitability Spark Plug is engineered around the OE specification used in many Mercedes-Benz and INFINITI turbocharged and direct-injection applications. NGK is a long-standing OE supplier with broad coverage across domestic and import vehicles, and this plug reflects that original-equipment focus with the correct heat range, gap, seat type, and electrode design for the listed vehicles. This part cross-references Bosch 7434 for the same application.

Compatible With select Mercedes-Benz Sprinter 1500, Sprinter 2500, GLA250, GLC350e, Metris, SLC300, B250, CLA250, E300, GLC300, C300, C350e, and SLK300 applications, as well as INFINITI Q50, QX30, and Q60 applications. Use NGK 90654 when the vehicle calls for the specified high-ignitability spark plug and 0.028" gap.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from degraded ignition performance
• Misfire conditions tied to incorrect plug type or gap
• Reduced throttle response from inconsistent spark delivery
• Service replacement needs at the OE-recommended interval

Installation Notes

Verify the vehicle application before installation and confirm the plug matches the required high-ignitability OE specification. The plug is specially indexed for the listed vehicles, so do not substitute an alternative design where the OE application calls for this part. Check the gap before installation and follow the manufacturer service interval for the vehicle.

Quality Assurance

NGK manufactures spark plugs to original-equipment standards and supplies a wide range of OE applications across North America and globally. Part number 90654 is built to match the specified OE requirements for the listed Mercedes-Benz and INFINITI vehicles.