Mishimoto 03-07 Ford 6.0L Powerstroke Replacement Oil Cooler KitOil is the lifeblood of an engine, and in a hardworking diesel engine like the 2003 2007 6. 0L Powerstroke, keeping that oil cool is essential to the engine's health and running. The stock 2003 2007 Powerstroke liquid to liquid oil cooler uses engine coolant to draw heat away from the oil and vent it through the engine radiator. It's a stout design that typically performs well for daily driven trucks. However, after over 12 years of service, many of