Precise Fitment & Compatibility: Engineered for optimal performance in popular Ford/Lincoln/Mercury vehicles. Work for 2004-2008 F-150, Expedition, Mustang, F-250, F-350 (including Super Duty) with V8 5.4L or 4.6L engines. Also fits 2005-2008 Lincoln Navigator and 2006-2008 Mercury Mountaineer. Compatible with Ford 5.4L spark plugs and compatible with Ford 4.6L Spark Plugs.
Package Includes: 8 Pcs iridium spark plugs.Warm Tips: SP546/SP515 are fit for the same model. SP515 is fit for most old car engines.SP546 is fit for latest car engines. Please check the product information carefully before ordering.
Rigorous Quality Assurance: Every spark plug undergoes strict quality control and testing. We ensure stable high-voltage output from the ignition coil to boost reliability and fuel efficiency, giving you confidence in every purchase.
Professional Installation Guide:For optimal performance and to prevent damage, we recommend using a torque wrench. The correct installation torque is 25-30 N.m (2.5-3.0 kgf-m). This ensures a perfect seal and reliable electrical connection.