NGK 5542 Spark Plug

NGK Laser Platinum Spark Plug 5542

NGK Laser Platinum Spark Plug 5542 is an OE-style ignition component built for precise spark delivery, stable resistance, and consistent performance in select Mercedes-Benz, Saab, Chrysler, Dodge, and Jeep applications. It uses a platinum center electrode tip with a copper core and a standard ground electrode layout for dependable combustion control.

The Laser Platinum line is NGK’s platinum spark plug family focused on original-equipment fit and long service life. Part number 5542, also identified as PFR6T-10G, is specified with a 0.040 in pre-gap, 14 mm thread diameter, 5/8 hex, flat seat, and 5,000 ohm resistance.

• Platinum center electrode tip for stable ignition performance
• Copper core center and ground electrodes
• 0.040 in pre-gap for listed applications
• Flat seat, 14 mm thread, 5/8 hex
• OE-equivalent design for select import and domestic vehicles
• NGK part number 5542 / PFR6T-10G

Detailed Product Overview

NGK manufactures spark plugs for a wide range of automotive applications and supplies original-equipment components for many vehicles in operation across North America. This Laser Platinum spark plug is built to match the specified heat range 6 and the listed terminal style, helping maintain the ignition characteristics required by the engine calibration. It is a direct service part for vehicles such as Mercedes-Benz SLK55 AMG, Mercedes-Benz C55 AMG, Saab 9-3, Saab 9-3X, Chrysler Crossfire, Dodge Dakota, and Jeep Grand Cherokee where this exact plug specification is called for.

This part cross-references 12787099 and FR6KPP33X for the same application.

What It Is Used For

• Replacing worn spark plugs that cause rough idle
• Restoring misfire-related drivability issues
• Addressing hard starting or extended crank conditions
• Correcting poor fuel burn from degraded plug electrodes
• Maintaining proper ignition performance at the specified gap

Installation Notes and Tips

Verify the engine calls for NGK 5542 or PFR6T-10G before installation. Set the gap to the vehicle-specific specification noted in the fitment data, including 0.040 in for Mercedes-Benz and Chrysler applications and 0.039 in for listed Saab applications. Use care during installation to avoid damaging the platinum tip or cross-threading the 14 mm plug threads. Confirm the correct heat range and seat type before final torque.

Compatible With 2005-2011 Mercedes-Benz SLK55 AMG, 2005-2006 Mercedes-Benz C55 AMG, 2003-2006 Mercedes-Benz CLK55 AMG, 2002-2004 Mercedes-Benz C32 AMG, 2001-2004 Mercedes-Benz SLK230, 2002-2004 Mercedes-Benz SLK32 AMG, 2002 Mercedes-Benz C230, 2010-2011 Saab 9-3, 2010-2011 Saab 9-3X, 2007-2009 Saab 9-3, 2004-2006 Saab 9-3, 2005-2007 Dodge Dakota, 2005-2006 Chrysler Crossfire, and 2002-2004 Jeep Grand Cherokee. For Saab 9-3 and 9-3X applications, follow the listed OE-equivalent service interval guidance in the fitment notes.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across domestic and import vehicles. This spark plug is produced to support original-equipment standards for durability and operational consistency in the applications listed above.