NGK 372 Spark Plug

NGK Iridium IX Spark Plug for Ford and Lincoln

NGK Iridium IX Spark Plug 372 is built for drivers who need precise ignition performance in a wide range of Ford, Lincoln, and Mercury applications. With an iridium center electrode, copper core, and 0.044 in. pre-gap, this plug supports consistent spark delivery for everyday driving and demanding engine conditions.

The Iridium IX Spark Plug line focuses on fine-wire ignition response and durable electrode construction. For buyers searching for a spark plug for a 2009-2014 Ford Expedition, 2009-2014 Lincoln Navigator, or 2009-2010 Ford F-150, NGK 372 is a direct-fit option that matches the listed engine applications.

Key Features

• Iridium center electrode tip material for stable spark performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 0.044 in. pre-gap for listed Ford, Lincoln, and Mercury fitments
• 5000 ohm resistance and non-removable nut terminal
• Tapered seat, 12 mm thread diameter, 14 mm hex size
• Heat range 6 with 26.5 mm reach

Detailed Description

NGK 372, also identified as ZNAR6AIX-11, is an Iridium IX spark plug engineered for secondary ignition service in compatible Ford, Lincoln, and Mercury engines. The iridium firing tip helps maintain a focused spark, while the copper core and nickel ground electrode support heat control and dependable combustion. This makes it a practical choice for owners looking for a replacement spark plug for Ford Expedition, Ford Explorer, Ford Mustang, Lincoln Navigator, and Mercury Mountaineer applications listed in the fitment data.

This part cross-references Hayden 372 for the same application. Use NGK 372 when you need a spark plug that matches the specified tapered-seat, 12 mm thread, and 0.044 in. gap requirements.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for listed Ford, Lincoln, and Mercury engines

Installation Notes and Tips

Verify engine style before installation, especially on 2008 Ford Expedition, Explorer, Explorer Sport Trac, F-150, F-250 Super Duty, F-350 Super Duty, and Mustang applications that require the newer engine style with brown coil boots only. The fitment notes also specify adjusting the spark plug gap to 0.044 inches. Confirm the tapered seat, 12 mm thread diameter, and 26.5 mm reach before installation.

Compatible With 2008-2014 Ford Expedition, 2008-2010 Ford Explorer, 2008-2010 Ford Explorer Sport Trac, 2008-2010 Ford F-150, 2008-2010 Ford F-250 Super Duty, 2008-2010 Ford F-350 Super Duty, 2008-2010 Ford Mustang, 2008 Lincoln Mark LT, 2008-2014 Lincoln Navigator, and 2008-2010 Mercury Mountaineer. Fits 2009-2014 Ford Expedition, 2009-2014 Lincoln Navigator, 2009-2010 Ford Explorer, 2009-2010 Ford Explorer Sport Trac, 2009-2010 Ford F-150, 2009-2010 Ford F-250 Super Duty, 2009-2010 Ford F-350 Super Duty, 2009-2010 Ford Mustang, and 2009-2010 Mercury Mountaineer.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its manufacturing and distribution network supports original-equipment standards across automotive, motorcycle, marine, and small engine applications, and that OE background is reflected in the construction of NGK 372.