NGK 5344 Spark Plug

NGK Laser Iridium Spark Plug 5344

NGK Laser Iridium Spark Plug 5344 is built for OE-style ignition performance in a wide range of Audi, Mercedes-Benz, Saab, Chrysler, Dodge, and Jeep applications. It uses an iridium center electrode tip, copper core construction, and a flat seat design to support consistent spark delivery and stable combustion.

As part of NGK’s Laser Iridium Spark Plug line, this plug reflects the brand’s OE supplier background and focus on original-equipment standards. The 5344 spark plug is a direct replacement choice for drivers servicing vehicles such as the Audi A4, Audi A6, Mercedes-Benz SLK55 AMG, and Saab 9-3.

Key Features

• Laser Iridium spark plug design for precise ignition performance
• Iridium center electrode tip with copper core construction
• Copper core ground electrode for dependable heat transfer
• Pre-gapped at .040 inches; some applications require adjustment to vehicle specification
• 14 mm thread diameter, 5/8 hex size, flat seat
• 1000 ohm resistance and non-removable nut terminal
• NGK part number 5344, manufacturer part number IFR6D10

Detailed Description

NGK 5344 is a Laser Iridium spark plug engineered for vehicles that call for a fine-wire iridium firing tip and OE-level fitment. The iridium center electrode helps maintain a consistent spark, while the copper core design supports heat control and stable operation under daily driving conditions. With a .040-inch pre-gap, flat seat, and 14 mm thread diameter, this plug is built for applications that specify a precise ignition setup.

This NGK spark plug 5344 is listed for fitment across multiple European and domestic platforms, including Audi A4, Audi A4 Quattro, Audi A5 Quattro, Audi A6, Audi A6 Quattro, Mercedes-Benz C32 AMG, SLK230, SLK32 AMG, SLK55 AMG, Saab 9-3, Saab 9-3X, Chrysler Crossfire, Dodge Dakota, and Jeep Grand Cherokee. For long-tail searches, this part is commonly selected as an NGK IFR6D10 spark plug for Audi A6 Quattro 2002-2004, Mercedes-Benz SLK55 AMG 2005-2011, and Saab 9-3 2004-2011 service replacement.

This part cross-references DENSO Auto Parts (e.g., 4504, 5344) for the same application.

What It Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle and inconsistent combustion
• Reduced throttle response from degraded spark performance
• Service replacement needs on OE-specified ignition systems

Installation Notes and Tips

• Verify the vehicle-specific gap before installation; several listed applications require a different gap than the .040-inch pre-gap.
• Use the correct torque procedure for the cylinder head and seat type.
• Check plug reach, thread diameter, and hex size against the original part before installation.
• Confirm the engine’s OE service interval and ignition specification for your exact year, make, and model.

Quality Assurance

NGK is a long-established OE spark plug supplier with manufacturing and distribution operations in North America and worldwide. The 5344 Laser Iridium Spark Plug is produced to support original-equipment standards for durability and operational performance.