NGK IFR6D10 5344 Laser Iridium Spark Plug Mercedes SLK Audi A4 A6 Saab 9-3

Vehicle Fitment

• 2002-2005 Audi A4 (Base, 1.8L / 2.0L I4 Turbo, FWD)
• 2003-2005 Audi A4 Cabriolet (Base, 1.8L / 2.0L I4 Turbo, FWD)
• 2002-2005 Audi A4 Quattro (Base, Avant, 1.8L / 2.0L I4 Turbo, AWD)
• 2004-2006 Audi A4 Quattro Cabriolet (Base, 1.8L / 2.0L I4 Turbo, AWD)
• 2009 Audi A4 Quattro (Base, 2.0L I4 Turbo TFSI, AWD)
• 2008-2010 Audi A5 Quattro (Base, 2.0L I4 Turbo TFSI, AWD)
• 2002-2004 Audi A6 (Base, 2.0L I4 Turbo, FWD)
• 2009-2011 Audi A6 (Base, 2.0L I4 Turbo, FWD)
• 2002-2004 Audi A6 Quattro (Base, Avant, 2.0L I4 Turbo, AWD)
• 2009-2012 Audi Q5 (Premium, Premium Plus, Prestige, 2.0L I4 Turbo TFSI, AWD)
• 2005-2006 Chrysler Crossfire (Base, Limited, SRT-6, 3.2L / 3.2L Supercharged V6)
• 2005-2007 Dodge Dakota (ST, Sport, SLT, Laramie, 3.7L V6)
• 2002-2004 Jeep Grand Cherokee (Laredo, Limited, Overland, Special Edition, 4.7L V8)
• 2002 Mercedes-Benz C230 (Kompressor, 1.8L I4 Supercharged)
• 2002-2004 Mercedes-Benz C32 AMG (Base, 3.2L V6 Supercharged)
• 2005-2006 Mercedes-Benz C55 AMG (Base, 5.5L V8)
• 2002 Mercedes-Benz CL600 (Base, 5.8L V12)
• 2003-2006 Mercedes-Benz CLK55 AMG (Base, 5.5L V8)
• 2002 Mercedes-Benz S600 (Base, 5.8L V12)
• 2001-2004 Mercedes-Benz SLK230 (Kompressor, 2.3L I4 Supercharged)
• 2002-2004 Mercedes-Benz SLK32 AMG (Base, 3.2L V6 Supercharged)
• 2005-2011 Mercedes-Benz SLK55 AMG (Base, 5.5L V8)
• 2004-2011 Saab 9-3 (Arc, Linear, Aero, 2.0L I4 Turbo)
• 2010-2011 Saab 9-3X (Base, 2.0L I4 Turbo, AWD)

Fitment Notes

• Audi fitment applies to turbocharged I4 petrol engines (1.8T / 2.0T TFSI) only; V6 and V8 Audi variants in the same models use different plugs.
• Jeep Grand Cherokee fitment applies to the 4.7L V8 (2002-2004) only; the 3.7L V6 and 4.0L I6 Grand Cherokee use different plugs.
• Dodge Dakota fitment applies to the 3.7L V6 only; the 4.7L V8 Dakota uses a different plug.
• Mercedes-Benz CL600 and S600 fitment is for the 2002 model year only (5.8L M137 V12).
• Chrysler Crossfire fitment covers both the 3.2L naturally aspirated and 3.2L supercharged (SRT-6) variants.
• Sold individually (1x plug per unit); cylinder count varies by application - confirm quantity needed before ordering.
• Replaces Mercedes-Benz OEM part number A 003 159 97 03.

Features

• Laser-welded fine wire iridium center electrode delivers a precise, stable spark with reduced voltage demand for improved combustion efficiency across diverse engine types.
• Platinum ground electrode pad provides slow, even wear in coil-on-plug (COP) distributorless ignition systems for extended service life.
• Iridium alloy offers 6x the hardness of platinum and an extremely high melting point - designed for longevity in supercharged, turbocharged, and naturally aspirated applications.
• Trivalent metal shell plating delivers superior anti-corrosion and anti-seizing properties for clean removal from aluminum cylinder heads.
• High-grade pure alumina ceramic insulator and 98% pure copper core prevent overheating and support consistent cold-start performance.
• Triple gasket seal prevents combustion gas leakage for long-term reliability at OEM service intervals.
• Corrugated insulator ribs prevent electrical flashover under high underhood temperatures.
• OE-equivalent design - direct replacement for Mercedes-Benz OEM part A 003 159 97 03.

Specifications

• NGK Part Number: IFR6D10
• NGK Stock Number: 5344
• Plug Type: Laser Iridium (Single Iridium Tip / Platinum Ground)
• Thread Diameter: 14mm
• Thread Pitch: 1.25mm
• Seat Type: Flat (Gasket)
• Thread Reach: 19mm (3/4")
• Hex Size: 5/8" (16mm)
• Terminal Type: Solid (Non-Removable Nut)
• Pre-Set Gap: 0.040" (1.0mm)
• Center Electrode Material: Iridium Fine Wire
• Ground Electrode: Standard / Platinum Pad
• Resistor: Yes - 1,000 Ohm
• Manufacturer Heat Range: 6
• Torque Spec (Cast Iron): 18-25.3 lb-ft
• Torque Spec (Aluminum): 18-21.6 lb-ft
• Mercedes-Benz OEM Replacement: A 003 159 97 03 / A0031599703

Included Components

• 1x NGK IFR6D10 Laser Iridium Spark Plug (pre-gapped at 0.040" / 1.0mm)

Product Description

The NGK IFR6D10 (Stock No. 5344) is a Laser Iridium spark plug engineered as an OE-equivalent replacement across an unusually wide range of European and Chrysler-era vehicles, spanning Audi's turbocharged I4 platform (A4, A5, A6, Q5), Mercedes-Benz supercharged and naturally aspirated engines (SLK, C-Class, CLK, CL, S-Class), Saab's turbocharged 9-3 lineup, Jeep Grand Cherokee V8, Chrysler Crossfire, and Dodge Dakota V6. It serves as the direct replacement for Mercedes-Benz OEM part A 003 159 97 03, making it a trusted choice for Euro platform maintenance at independent shops and dealership-alternative service intervals.

The fine-wire iridium center electrode paired with a platinum ground pad delivers slow, consistent wear and reduced voltage requirements - key attributes for the varied ignition system demands of supercharged, turbocharged, and large-displacement naturally aspirated engines in this fitment group. Pre-gapped at 0.040" (1.0mm) from the factory, installation is straightforward and no gap adjustment is required under stock conditions. Cylinder counts vary significantly across applications - from 4-cylinder Audi and Saab engines to 12-cylinder Mercedes-Benz flagships - so confirm the number of plugs needed per vehicle before ordering.