NGK 6240 Spark Plug

NGK Laser Platinum Spark Plug 6240 Overview

NGK Laser Platinum Spark Plug 6240 is an OE-style ignition component built for Nissan and INFINITI applications that call for a 14 mm, flat-seat plug with a 0.044" pre-gap. It uses a platinum center electrode tip, nickel ground electrode, and a copper core to support consistent spark delivery in daily-driven engines.

As part of NGK’s Laser Platinum line, this spark plug is engineered for long service life and stable ignition performance in vehicles such as the Nissan Maxima, Nissan Murano, INFINITI G35, and INFINITI FX35. Part number 6240 is also identified as NGK PLFR5A-11.

Key Features

• Laser Platinum spark plug with platinum center electrode tip
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with standard tip design and standard configuration
• Pre-gapped to 0.044" for listed applications
• 5 k? resistance for ignition system compatibility
• 14.00 mm thread diameter, 5/8 hex size, flat seat
• NGK part number 6240 / PLFR5A-11

Detailed Product Description

NGK 6240 is a Laser Platinum spark plug designed around OE specifications for a wide range of Nissan and INFINITI engines. The platinum tip helps maintain stable electrode wear characteristics, while the copper core supports thermal control under normal operating conditions. With a manufacturer heat range of 5 and a factory pre-gap of 0.044", this plug is specified for vehicles including the Nissan 350Z, Nissan Altima, Nissan Pathfinder, Nissan Titan, Nissan Xterra, INFINITI M35, INFINITI M45, and INFINITI QX56.

NGK’s OE manufacturing background and broad North American coverage make this a direct replacement choice for drivers servicing ignition systems on the Nissan Maxima, Nissan Quest, and INFINITI FX45. This part cross-references Autolite APP5325 and Bosch 7975 for the same application.

Common Issues This Part Can Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire codes related to plug wear or gap drift
• Reduced throttle response from inconsistent spark delivery
• Maintenance replacement for high-mileage OE spark plug service intervals

Installation Notes and Tips

Verify the engine application before installation and confirm the specified 0.044" gap for the listed vehicle. Use the correct 5/8-inch spark plug socket and follow the manufacturer torque specification for the cylinder head material. Inspect ignition coils, boots, and plug wells during service, especially on Nissan Maxima, Nissan Murano, and INFINITI G35 applications where access can vary by engine layout.

Compatible With: Fits 2002-2008 Nissan Maxima, N/A; Fits 2003-2007 Nissan Murano, N/A; Fits 2003-2007 INFINITI G35, N/A; Fits 2003-2008 INFINITI FX35, N/A; Fits 2003-2008 INFINITI FX45, N/A; Fits 2006-2010 INFINITI M45, N/A; Fits 2004-2009 Nissan Quest, N/A; Fits 2004-2006 Nissan Titan, N/A; Fits 2002-2006 Nissan Altima, N/A; Fits 2001-2006 Nissan Pathfinder, N/A.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Part number 6240 is built to original-equipment standards for durability and operational performance across the listed Nissan and INFINITI applications.