Brand ?PHILTOP Part Spark Plugs OEM Part Number 41-101,12681664, 12568387,XP606 Center Electrode Core Material Copper Center Electrode Tip Material Iridium Ground Electrode Tip Design Standard Ground Configuration Standard Pre-Gap Size 1.5 mm Resistance 7500 Ohms Hex size 16 mm Insulator Height 24.89 mm Manufacturer Heat Range 4 Seat Type Tapered Reach 17.272 mm Thread Diameter 14 mm [Faster Starts] The double iridium spark plug enhances the center electrode design, concentrating spark energy and improving vehicle ignitability. It leads to smoother engine operation and eliminates misfire concerns. [Longer Lifespan] PHILTOP automotive spark plugs feature double iridium construction for durability and resistance to heat and corrosion. They effectively burn off carbon deposits, extending the plug's lifespan. [High Efficiency] Compared with ordinary spark plugs, the needle-like protrusion of the side electrode of the double iridium spark plug enables the spark plug to quickly ignite the mixed combustible gas in the cylinder and start the engine, which can make the vehicle start faster. [Trivalent metal coating] The spark plug offers high temperature durability and robust construction, with excellent resistance to corrosion and seizure, ensuring easy installation and disassembly. [Solid copper core] 98% pure copper core provides excellent heat dissipation, conductivity and ultra-wide thermal range. PHILTOP Spark Plug Details Product Material? Double Iridium Quantity included? 4 pack Adaptation? Fitment? Corolla 1998-2001/Ranger 1983-1996LeSabre 1997-2005/F150 1994-1996Impala 2000-2005/Equinox 2005-2009Grand Prix 1997-2008/Mus-tang 1994-2000Taurus 1990-1995 1997-2006/Malibu 2002-2006/F350 Super Duty 2000-2002Matrix 2003-2008/F250 Super Duty 2005-2006Town Car 1990-1992/Grand Marquis 1991-1993Grand Marquis 1995-2004/Crown Victoria 2000-2007Lucerne 2006-2008/Century 2002-2005Park Avenue 1996-2005 OE: 41-101 Spark plug action? Function One: The high melting point of the double iridium material effectively reduces carbon accumulation, and the side electrode technology does not wear the plug gap, extending its service life Function two: The spark plug burns fast and has a wide range of sparks, making the vehicle start faster Function three: The gap between the electrodes allows fuller ignition, reduces fuel consumption, burns fuel more efficiently, and reduces emissions Installation Technique?