NGK 5547 Spark Plug

NGK Laser Platinum Spark Plug 5547 Overview

NGK Laser Platinum Spark Plug 5547 is an OE-style ignition component built for precise fitment and stable spark delivery in select Audi and Volkswagen applications. It uses a platinum center electrode tip, copper core construction, and a 3-ground-electrode design to support consistent combustion performance.

Compatible with select 2007-2012 Audi A8 Quattro, Audi S5, Audi A6 Quattro, Audi S6, Audi Q7, Audi S8, and 2007-2009 Volkswagen Touareg applications, this NGK spark plug is specified with a 0.036 in. pre-gap on most listed vehicles and a 0.032 in. gap on the 2007-2011 Audi S6. Part number 5547 is also identified as PFR6W-TG.

Key Features

• Laser Platinum spark plug from NGK
• Platinum center electrode tip for durable spark delivery
• Copper core center and ground electrodes
• Standard ground electrode tip and standard ground configuration
• 3-ground-electrode design
• 1000 ohm resistance
• 14.00 mm thread diameter, 0.75 in. reach, 5/8 in. hex
• Flat seat design with non-removable nut terminal
• Manufacturer heat range 6
• Part number 5547 / PFR6W-TG

Product Details

NGK’s Laser Platinum line is built around OE-level engineering and long service life expectations for modern ignition systems. As a major OE supplier in North America, NGK applies its manufacturing experience to spark plugs used in domestic and import vehicles, including Audi A8 Quattro, Audi S5, Audi A6 Quattro, Audi S6, Audi Q7, Audi S8, and Volkswagen Touareg models listed here. The platinum tip helps maintain electrode integrity, while the copper core construction supports efficient heat transfer and dependable ignition performance.

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

What This Spark Plug Helps Address

• Misfire conditions caused by worn or fouled spark plugs
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Service interval replacement on listed Audi and Volkswagen engines

Installation Notes and Tips

Verify the required gap before installation and compare it to the vehicle-specific listing, especially on the 2007-2011 Audi S6 where a 0.032 in. gap is noted. Confirm thread diameter, reach, seat type, and terminal style against the original plug before installation. Use proper torque procedures for aluminum cylinder heads and inspect ignition coils, boots, and wiring for wear while servicing the plugs.

Quality Assurance

NGK is a long-established OE supplier with broad coverage across automotive, motorcycle, marine, and small engine applications. Part number 5547 is manufactured to support original-equipment standards for durability and operational performance in the listed Audi and Volkswagen fitments.