Doc's Diesel Crankcase Filters: Engines produce blow-by gases—unburned fuel, water vapor, and contaminants—that escape into the crankcase. Without a crankcase ventilation filter, these gases re-enter the intake system with oil mist, causing sludge, oil degradation, and engine damage. The filter keeps oil cleaner, extending its life and improving engine efficiency, reducing maintenance costs. It also traps oil vapors and hydrocarbons, cutting harmful emissions and helping diesel engines meet strict regulations. Excess crankcase pressure can reduce engine performance and damage components like turbochargers. The filter prevents this, maintaining optimal engine performance and fuel efficiency. Product Details: Crankcase Ventilation Filter made of durable high quality material resistance to heat and oil Quality tested and inspected to ensure peak efficiency Filters out oil mist and other harmful particulates that get routed back to the intake system Doc's auto parts all have an OEM design, fit, and function that meets or exceeds OEM Requirements Fitment + Interchange: Vehicle Fitment: 2007.5-2025 Ram 6.7L Cummins 2500, 3500, 4500, 5500 Interchange: Doc's D804418: Mopar/Fleetguard CV52001, Dorman 904-418 Change Interval: Above all recommendations, change according to your vehicle’s manufacturer warranty. Crankcase Filters: Every 50,000-60,000 miles or 67,500 miles maximum