Motorcraft SP-546 Platinum Spark Plugs OEM PZK14F For F150 F250 5.4L Pack of 8

The Motorcraft SP546 (also known as SP-546 or PZK14F) is a high-quality platinum spark plug engineered for optimal performance in various Ford and Lincoln vehicles. It serves as an updated replacement for the SP515, addressing earlier design concerns and enhancing reliability. 

Product Specifications

• Part Number: SP546 / PZK14F
• Thread Size: 16mm
• Hex Size: 9/16 inch (14mm)
• Gap: 0.045 inches (1.14 mm)
• Torque Spec: 30–38 Nm (22–28 ft-lbs)
• Design: One-piece construction to prevent electrode breakage
• Shell: Nickel-plated for corrosion resistance
• Insulator: Multi-rib design to prevent flashover
• Electrode: Nickel-alloy for extended service life
• Service Interval: Up to 60,000 miles under normal driving conditions 

Vehicle Compatibility

The SP546 is compatible with a range of Ford and Lincoln models, particularly those equipped with 5.4L V8 and 6.8L V10 engines. Notable applications include: 

• Ford F-150: 2004–2008 (5.4L V8)
• Ford F-250 / F-350 Super Duty: 2005–2006 (6.8L V10)
• Ford F-450 / F-550 Super Duty: 2009–2010 (6.8L V10)
• Ford Expedition: 2005–2008 (5.4L V8)
• Ford E-350: 2007 (6.8L V10)
• Lincoln Navigator: 2005–2008 (5.4L V8)
• Lincoln Mark LT: 2006–2008 (5.4L V8) 

Note: For vehicles with black coil boots, the SP546 is the recommended spark plug. If your vehicle has brown coil boots, a different plug (such as SP509) may be required. 

Cross-Reference Part Numbers

The Motorcraft SP546 is equivalent to several other spark plug models, including:

• Motorcraft: SP515, PZH14F, PZT14F
• Autolite: HT15
• Champion: 7989

These alternatives can be considered if the SP546 is unavailable, but it’s always recommended to use the OEM-specified part for optimal performance.