Doc's Diesel Fuel/Water Separators: Doc's premium fuel filters remove contaminants like 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. All Doc's fuel filters are designed to meet or exceed OEM requirements! Product Details: Designed with high efficiency media Premium 3-layer pleated cellulose glass media that offers unparalleled protection for your fuel system Large capacity filter pleats that allow exceptional flow rates Constructed with high strength carbon steel housing (when applicable) Comes ready to install with o-rings (when applicable) Doc's auto parts all have an OEM design, fit, and function that meets or exceeds OEM Requirements Micron + Efficiency Rating: 3 Micron @ 96.92% Efficiency Rating - Efficiency SAE J1985 3rd-Party Test Results Fitment + Interchange: Vehicle Fitment: 2008-2010 Ford 6.4L Super Duty F250, F350, F450, F550 Interchange: Doc's DCS10263: Motorcraft FD4617, Wix 33963, Baldwin PF7934, Premium Guard DF4609A, Purolator F66301 Change Interval: Above all recommendations, change according to your vehicle’s manufacturer warranty. Fuel Filter/Water Separators: Every 5,000-10,000 miles or 15,000 miles maximum