Motorcraft FA-1778 Air Filter — What Is It and Why Does Your 6.0L Powerstroke Engine Need It?
If your 2003-2007 Ford F-250, F-350, or Excursion has a 6.0L Powerstroke diesel engine, regularly changing the air filter is one of the simplest and most effective maintenance tasks you can perform. The Motorcraft FA-1778 is the genuine OEM air filter for your engine, and in this guide, we'll explain the features that make it the right choice and how you can replace it yourself in minutes.
What is the FA-1778?
The Motorcraft FA-1778 is the genuine OEM engine air filter for 2003-2007 Ford 6.0L Powerstroke diesel engines. The Ford OEM part number is 4C3Z-9601-AA. It is a high-density multi-fiber filter designed to prevent dirt, dust, and debris from entering your engine while maintaining strong airflow for diesel performance.
Key Features
98.5% filtration efficiency — high-density multi-fibrous media
Tight polyurethane seals — leak-proof design
Chemically treated against oil and moisture damage
Excellent dirt retention capacity for long service intervals
Motorcraft 2-year / unlimited mileage warranty backed by Ford Motor Company
The only air filter recommended by Ford for your 6.0L Powerstroke engine
Symptoms of a clogged air filter
Reduced power and slow acceleration
Reduced fuel economy
Black smoke from exhaust
Irregular idling or engine misfires
In severe cases, engine malfunction light may illuminate
In a diesel engine like the 6.0L Powerstroke, a clogged air filter puts extra load on the turbocharger and can accelerate wear on the engine's internal components. Timely replacement is inexpensive insurance.
How often should you replace it?
Under normal driving conditions, every 15,000–30,000 miles
Under dusty or off-road conditions, every 10,000–15,000 miles
Check at every oil change — replace if dirty or damaged
Vehicle compatibility
2003–2007 Ford F-250 Super Duty 6.0L Powerstroke Diesel
2003–2007 Ford F-350 Super Duty 6.0L Powerstroke Diesel
2003–2005 Ford Excursion 6.0L Powerstroke Diesel
How to replace — in less than 10 minutes
Open the hood and locate the air filter housing on the driver's side
Remove the air filter housing cover from its clips or screws
Remove and discard the old FA-1778 filter
Clean out any debris inside the housing
Install the new FA-1778 filter — ensure the gasket is properly seated
Reinstall the housing cover and clips
Every order from SayParts includes: Includes: FREE step-by-step installation video — watch the entire FA-1778 replacement process before you begin.
Why buy from SayParts?
Genuine Motorcraft FA-1778, with 2-year Ford warranty
Free installation video with every order
Free worldwide shipping
Save on recommended retail price — $69.79 instead of $49.99
Order Motorcraft FA-1778 from SayParts →
Fits only 2003–2007 Ford F-250, F-350 Super Duty and 2003–2005 Ford Excursion models with 6.0L Powerstroke Diesel engine.