NGK 6509 Spark Plug

NGK Iridium IX Spark Plug 6509 Overview

NGK Iridium IX Spark Plug 6509 is built for drivers who need consistent ignition performance, stable combustion, and OE-style fitment across a wide range of domestic and import vehicles. With an iridium center electrode, copper core, and 5,000 ohm resistance, this plug supports reliable spark delivery in applications such as Ford F-150, Ford Explorer, Chevrolet Traverse, and Buick Enclave.

The NGK Iridium IX Spark Plug line focuses on durable ignition performance with a fine iridium tip, tapered seat design, and a pre-gap of 0.044 inches. Part number 6509 is also listed as LTR6IX-11, making it easier to match the correct replacement during maintenance or tune-up service.

Key Features

• Iridium center electrode tip material for precise spark delivery
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core with standard ground configuration
• Taper cut ground electrode tip design for consistent ignition performance
• 5,000 ohm resistance for ignition system compatibility
• Pre-gapped at 0.044 inches
• Tapered seat, 14 mm thread diameter, 5/8 hex size
• NGK part number 6509 / LTR6IX-11

Detailed Description

NGK 6509 is an Iridium IX spark plug engineered for vehicles that call for a tapered-seat, 14 mm spark plug with a 0.044-inch pre-gap. The iridium tip helps maintain a stable spark point, while the copper core supports heat dissipation for dependable operation under everyday driving conditions. This makes it a practical replacement for long-tail searches such as NGK Iridium IX spark plug for Ford F-150 2011-2021, NGK 6509 for Chevrolet Traverse 2009-2024, and NGK spark plug for Buick Enclave 2008-2024.

NGK’s OE supplier background and broad North American coverage support this plug’s application across domestic and import platforms. It cross-references Bosch 6728 for the same application.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Rough idle related to degraded spark quality
• Reduced throttle response from aging plugs
• Maintenance replacement for vehicles calling for a 0.044-inch gap

Installation Notes and Fitment Tips

• Verify the vehicle-specific gap requirement before installation; some listed applications require adjustment from the 0.044-inch pre-gap.
• Compatible With 2021-2024 Buick Enclave, N/A.
• Compatible With 2024 Chevrolet Traverse Limited, N/A.
• Compatible With 2022-2024 Ford Transit-150, N/A.
• Compatible With 2021-2023 Ford Explorer, N/A.
• Compatible With 2011-2021 Ford F-150, N/A.
• Compatible With 2009-2020 Chevrolet Traverse, N/A.
• Compatible With 2008-2020 Buick Enclave, N/A.
• Compatible With 2011-2019 Ford Mustang, N/A.
• Compatible With 2006-2015 Mazda MX-5 Miata, N/A.
• Compatible With 2004-2007 Cadillac CTS, N/A.

Quality Assurance

NGK manufactures spark plugs for a wide range of automotive, motorcycle, marine, and small engine applications, with original-equipment standards and North American distribution support. Part number 6509 is built to meet the specifications listed above for direct replacement service in confirmed applications.