Motorcraft SP580X is an OEM-style iridium spark plug, plug number CYFS12YT4, built for verified Ford and Lincoln 3.5L V6 EcoBoost and 5.0L V8 applications from the 2010-2021 coverage window. It helps address hard starts, misfire concerns, worn electrodes, and declining fuel economy by restoring the ignition hardware with a Ford Engineering-standard replacement using iridium, copper, platinum, nickel, and resistor construction.

Motorcraft SP580X Spark Plug Features:

• Iridium-enhanced center electrode with a copper core supports stable spark energy and long service life in demanding turbocharged and V8 ignition systems.
• Nickel ground electrode tip and proprietary platinum pad on the side wire help resist oxidation and arc erosion during repeated firing cycles.
• Nickel-plated shell adds corrosion resistance for serviceability in engine bays exposed to heat, moisture, and road splash.
• Tapered seat design uses a 14 mm thread size, 16 mm hex size, and 0.984 in. thread reach, also referenced as 25 mm.
• Built-in spark plug resistor helps control ignition noise while supporting quick starts and smooth acceleration when installed in a verified application.
• Heat range 6 specification matches the intended Ford and Lincoln engine applications listed for this plug.
• Compact plug body measures approximately 0.9 in. x 0.8 in. x 3.7 in. and weighs about 0.1 lb.