NGK 4696 Spark Plug

NGK Laser Iridium Spark Plug for Mercedes-Benz

NGK Laser Iridium Spark Plug 4696 is built for Mercedes-Benz engines that call for precise ignition performance and OE-style durability. This spark plug uses an iridium center electrode tip, a copper core, and a standard ground electrode layout to support consistent spark delivery in demanding twin-spark and dual-plug applications.

Compatible With Mercedes-Benz C240, C320, CL500, CLK320, E320, ML320, S430, SL500, and other listed applications, NGK part number 4696 is a direct-fit ignition service part for a wide range of late-1990s and early-2000s models.

Key Features

• Laser Iridium center electrode tip for stable ignition performance
• Copper core center and ground electrodes for efficient heat transfer
• Pre-gapped at .040 for specified applications
• Standard ground configuration with one ground electrode
• Flat seat design with 14.00 mm thread diameter and 5/8 hex size
• 1000 ohm resistance for OE-style ignition system compatibility
• NGK part number 4696, also identified as IFR5D10

Product Details

NGK’s Laser Iridium Spark Plug line is engineered around OE service standards and broad vehicle coverage. As a major original equipment supplier, NGK applies its manufacturing experience to spark plugs used in domestic and import vehicles, including Mercedes-Benz twin-spark and dual-plug engines. This plug features an iridium tip for the center electrode, copper core construction, and a standard ground electrode design to support reliable combustion and steady engine response.

This part cross-references Bosch 7422 and Federal Parts 4696 for the same application. Search terms such as Mercedes-Benz C320 spark plug, Mercedes-Benz E320 iridium spark plug, and NGK 4696 spark plug help identify the correct replacement for the listed vehicles.

Common Issues This Part Addresses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to aged ignition service parts
• Reduced throttle response from degraded plug performance
• Maintenance replacement for Mercedes-Benz twin-spark and dual-plug engines

Installation Notes and Tips

Verify the engine-specific gap and application notes before installation. Several listed Mercedes-Benz models use twin-spark or dual-plug configurations, and some applications call for a .039 or .044 gap based on the vehicle and engine setup. Confirm the correct heat range, seat type, and thread reach before service. Use proper torque procedures and inspect ignition components during spark plug replacement.

Quality Assurance

NGK is a long-established OE supplier with extensive coverage across automotive, motorcycle, marine, and small engine applications. Part number 4696 is manufactured to support original equipment standards for durability and operational performance in the listed Mercedes-Benz applications.