Review on 🔝 Upgrade to FD4616 Diesel Fuel Filter: Compatible with 03-07 Ford F250 F350 F450 F550 Super Duty, 03-05 Ford Excursion 6.0L Powerstroke | Replaces 3C3Z9N184CB 3C349N074BA 3C3Z9N184CA | Enhanced Upper Fuel Bowl with Lower Lifter Pump Filter by David Roberts

If you follow the manufacturer's recommendation to change these filters every two oil changes, you'll see how dark they become are and how much they are really needed. I used OEM and tried these aftermarket filters for the first time because the reviews here on Amazon were good and saved $20 over OEM. The under cover detached from the secondary fuel filter under the truck, bypassing fuel contamination entirely. Diesel injectors are way more expensive than the money saved on those cheap Chinese aftermarket filters.