DOC'S DIESEL FUEL FILTERS - Doc's Fuel Filters remove contaminants like separate water from dirt, rust, and debris, protecting fuel system components and ensuring peak engine performance. They optimize fuel flow and pressure, enhancing acceleration, fuel economy, and vehicle performance. With a focus on maximizing filtration media surface area, our high-quality filters come complete with o-rings as needed. INTERCHANGE - Replaces Motorcraft FD4616, Replaces Wix 33899, Replaces Baldwin PF7812, Replaces Premium Guard DF9667A, Replaces Purolator FS5590 FITMENT - Compatible with 2003-2007 Ford 6.0L Super Duty F250, F350, F450, F550, 2003-2005 Ford 6.0L Excursion, 2004-2008 Ford 6.0L F650, F750 THIRD PARTY TESTED - 3 Micron @ 96.92% Efficiency Rating REPLACEMENT GUIDELINES - Above all recommendations, change according to your vehicle’s manufacturer warranty. Fuel Filters should be changed every 5,000 to 10,000 miles, or 15,000 maximum. Doc's Fuel Filters remove contaminants like separate water from dirt, rust, and debris, protecting fuel system components and ensuring peak engine performance. They optimize fuel flow and pressure, enhancing acceleration, fuel economy, and vehicle performance. With a focus on maximizing filtration media surface area, our high-quality filters come complete with o-rings as needed. INTERCHANGE: Replaces Motorcraft FD4616, Replaces Wix 33899, Replaces Baldwin PF7812, Replaces Premium Guard DF9667A, Replaces Purolator FS5590. FITMENT: Compatible with 2003-2007 Ford 6.0L Super Duty F250, F350, F450, F550, 2003-2005 Ford 6.0L Excursion, 2004-2008 Ford 6.0L F650, F750