NGK 6507 Spark Plug

NGK Laser Iridium Spark Plug 6507

NGK Laser Iridium Spark Plug 6507 is built for OE-style ignition performance with an iridium center electrode, nickel ground electrode, and a 5,000-ohm resistor for stable spark delivery. It is a direct replacement option for a wide range of import and domestic applications, including Volvo S60, Volvo XC90, Porsche 911, and Mitsubishi Montero fitments.

Key Features

• Laser Iridium design with an iridium center electrode tip for consistent ignition performance
• Nickel ground electrode with standard tip and standard configuration
• 5,000-ohm resistor for electrical noise suppression
• Flat seat, 14 mm thread diameter, 0.75 reach, and 5/8 hex size
• Pre-gapped at .032 inches for many listed applications; verify vehicle-specific gap before installation
• OE supplier heritage from NGK, a long-time manufacturer for domestic and import vehicles

Product Details

NGK part number 6507, also identified as IFR6B, is a Laser Iridium spark plug engineered for vehicles that call for precise ignition control and long service intervals. The copper core supports heat transfer, while the iridium tip helps maintain a consistent spark under demanding operating conditions. This spark plug is listed across many applications, including 2003-2009 Volvo S60, 2003-2006 Volvo XC90, 2007-2008 Porsche 911, and 2003-2006 Mitsubishi Montero. This part cross-references DENSO Auto Parts 4504 for the same application.

Common Problems This Part Addresses

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Misfire conditions related to degraded plug electrodes
• Reduced throttle response from inconsistent spark delivery
• Service interval replacement on vehicles specified for Laser Iridium plugs

Installation Notes and Tips

Confirm the vehicle’s required gap before installation, since listed applications vary between 0.028, 0.030, 0.032, 0.035, and 0.038 inches depending on make and model. Use the correct torque procedure for the cylinder head material and verify the flat-seat design matches the original equipment specification. Fits 2003-2009 Volvo S60, N/A; Fits 2003-2006 Volvo XC90, N/A; Fits 2007-2008 Porsche 911, N/A; Fits 2003-2006 Mitsubishi Montero, N/A; Fits 1995-2005 Dodge Neon, N/A.

Quality Assurance

NGK is a major OE spark plug supplier with more than 80 years of automotive manufacturing experience and broad coverage across domestic and import vehicle applications. The brand’s North American and global manufacturing and distribution network supports consistent product availability and OE-focused production standards.