If you are noticing engine oil in your coolant system, oil or coolant leaking from the oil cooler or engine coolant mixed with your engine oil then your oil cooler might need to be looked at or replaced. This engine oil cooler kit also includes viton gasket seals needed for the proper service on your vehicle. Fits The Following 6.0L Powerstroke Vehicles 2004-2005 Ford E-350 Club Wagon 2004-2010 Ford E-350 Super Duty 2004-2007 Ford E-450 Super Duty 2003-2005 Ford Excursion 2003-2007 Ford F-250 Super Duty 2003-2007 Ford F-350 Super Duty 2003-2007 Ford F-450 Super Duty 2003-2007 Ford F-550 Super Duty GWA199 Fix Your Powerstroke Vehicle and Restore Driveability The engine oil cooler is a heat-exchanger which is commonly a radiator type of cooler which cools engine oil from the engine. It removes excess heat from the oil using the engine coolant that flows around as the engine oil passes through the cooler. When the engine cooler fails or leaks your coolant may mix with the oil and experience overheating and loss of pressure and power in your engine. By replacing the engine oil cooler with this kit you can eliminate these issues. Replaces Part Numbers: 3C3Z 6A642 CA 904-228 015339 OCK388 This is a compatible replacement part manufactured by AA Ignition. This oil cooler kit is NOT a genuine Ford or Dorman part. Ford and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this oil cooler kit fits.