Doc's Diesel Engine Air Filters: Doc's Diesel Premium Engine Air Filters are made for hard-working diesel engines that don’t quit. They block out dirt, dust, and debris that can wear down your motor over time. The heavy-duty silicone gasket holds a tight seal, even when you're running in rough, dusty conditions, and deep pleated filter paper traps more grime to help your truck run longer, stronger, and more efficiently. Product Details: Includes 6 Engine Air Filters Premium filter media maximizes protection against contaminants and minimizes unnecessary engine wear Silicone sealing gasket ensures a proper seal even under harsh conditions Embossed filter paper pleats trap more dirt and last longer Easily install in only 5-10 minutes Doc's auto parts all have an OEM design, fit, and function that meet or exceed OEM Requirements Micron + Efficiency Rating: 99.25% / 344.2G Dust Holding Capacity - Efficiency ISO 5011 3rd-Party Test Results Fitment, Interchange + Doc's Part Number: Vehicle Fitment: 2011-2016 Ford 6.7L Powerstroke F250, F350, F450, F550 Interchange: Doc's DPA6109-6: Motorcraft FA1902, Wix 49902, Baldwin PA4433, Purolator TA36109 Doc's Part Number: DPA6109-6 Change Interval: Above all recommendations, change according to your vehicle’s manufacturer's warranty. Engine Air Filters: Every 5,000-10,000 miles or 12,000 miles maximum