Description Genuine Motorcraft Platinum Spark Plug – SP-546 (PZK-14F) Part Number: SP-546OEM Equivalent: Factory-installed plug from newManufacturer: Motorcraft (Ford Genuine) Construction & Specs Electrode Type: Platinum (center) Center Electrode Core: Nickel Center Electrode Tip: Platinum Ground Electrode Tip: Nickel Thread Size: M16 x 1.50 Seat Style: Tapered Drive Size: 14 mm Resistor: Yes Insulator: Standard, non-projected Heat Range: Motorcraft 1 Shell Finish: Nickel-plated (corrosion resistant) Performance & Benefits OEM-specified spark plug fitted when the vehicle rolled off the assembly line Designed for quick cold starts, smooth acceleration, and consistent idle Supports enhanced fuel economy Long service life: approx. 60,000–100,000 miles (depending on application & use) Copper-glass seal bonds the insulator, terminal post, and center electrode to: Maintain required firing voltage Reduce misfires Improve durability under heat and load Typical Applications Commonly used in various Ford petrol engines (including Modular V8 and selected inline applications – exact fitment depends on model/year). ⚠️ Important: Always confirm vehicle application and calibration requirements.Forced-induction or modified engines may require a different heat range or plug type.
