NGK 6510 Spark Plug

NGK Iridium IX Spark Plug for Cadillac XTS and CTS

NGK Iridium IX Spark Plug 6510 is built for precise ignition performance in select Cadillac applications. It combines an iridium center electrode with a nickel ground electrode and a tapered seat design to support consistent spark delivery and reliable combustion.

Key Features

• NGK Iridium IX Spark Plug line for performance-focused ignition service
• Iridium center electrode tip for durable spark delivery
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 5,000 ohm resistance and non-removable nut terminal
• 14 mm thread diameter, 25.00 mm reach, 5/8 hex size
• Manufacturer heat range 7 with a pre-gap size of .044
• Tapered seat type for the listed applications

Detailed Description

Part number 6510, also identified as LTR7IX-11, is an NGK Iridium IX spark plug engineered for select 2014 Cadillac CTS and 2014-2015 Cadillac XTS applications. The iridium tip helps maintain stable ignition performance, while the copper core supports heat dissipation under normal engine operating conditions. NGK’s OE manufacturing background and broad North American coverage make this a practical choice for drivers seeking a direct replacement spark plug for the listed vehicles. This part cross-references DENSO Auto Parts 5340 for the same application.

What This Spark Plug Helps Address

• Engine misfire caused by worn or fouled spark plugs
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Maintenance replacement for select Cadillac CTS and Cadillac XTS models

Installation Notes and Tips

Verify the vehicle application before installation and confirm the specified gap for the engine. For the listed fitments, use the correct tapered-seat spark plug specification and check the existing plug condition for signs of oil, carbon, or overheating before replacement. Part number 6510 should be matched to the engine’s required heat range and thread dimensions during service.

Quality Assurance

NGK is a long-established OE spark plug manufacturer with extensive coverage across domestic and import vehicles in North America. The 6510 Iridium IX spark plug is produced to support original-equipment standards for durability and operational consistency in the listed Cadillac applications.