NGK 6371 Spark Plug

NGK Laser Platinum Spark Plug 6371

NGK Laser Platinum Spark Plug 6371 is an OE-style ignition component built for stable spark delivery and consistent engine performance. It uses a platinum center electrode, nickel ground electrode, and a 5,000 ohm resistor to support clean ignition operation in a wide range of Nissan and Infiniti applications.

The Laser Platinum line focuses on OE-level fit and durability, with a pre-gapped .040 inch design, flat seat, 14 mm thread diameter, and 5/8 inch hex for service-friendly replacement. This part number 6371 is a direct match for several Nissan Frontier, Pathfinder, Quest, Xterra, Altima, and Infiniti QX4 applications listed below.

Key Features

• NGK Laser Platinum Spark Plug for secondary ignition service
• Platinum center electrode tip for durable spark performance
• Nickel ground electrode with standard ground configuration
• 5,000 ohm resistance for ignition system compatibility
• Pre-gapped at .040 inch
• Flat seat, 14 mm thread diameter, 0.75 inch reach, 5/8 inch hex
• OE supplier heritage from NGK, a major spark plug manufacturer for domestic and import vehicles

Detailed Description

NGK 6371 is a Laser Platinum spark plug engineered around OE specifications for vehicles that call for FR5AP-10 service requirements. The copper core center electrode and platinum tip help maintain consistent ignition characteristics, while the standard ground design supports reliable combustion under normal driving conditions. This spark plug is a practical replacement choice for drivers servicing Nissan Frontier, Pathfinder, Quest, Xterra, Altima, and Infiniti QX4 models with the listed factory applications.

This part cross-references AMS Automotive 4701 for the same application.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weakened ignition output
• Misfire conditions related to degraded plug electrodes
• Reduced throttle response from inconsistent spark delivery
• Service replacement for OE-specified ignition maintenance intervals

Installation Notes and Tips

Verify the vehicle’s required plug specification before installation, including thread diameter, reach, seat type, and gap. For the listed applications, fitment includes 1998-2000 Infiniti QX4; 1999-2000 Nissan Quest; 1998-2000 Nissan Pathfinder; 1999-2000 Nissan Frontier; 2000 Nissan Xterra; and 1999 Nissan Altima and Frontier. Confirm the engine’s ignition service requirements and inspect coil boots, wires, and related secondary ignition components during replacement.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across domestic and import vehicle applications. Part number 6371 is built to OE standards for durability and operational performance, with manufacturing and distribution support from NGK’s North American and global facilities.