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For diesel fans who appreciate the inner workings of engines, the 6.4 Powerstroke engine boasts a mix of innovation and refinement. Despite some drawbacks, it has hidden qualities that shine through for those in the know. Fuel-contaminated engine oil was another problem with the 6.4 Powerstroke. In this scenario, fuel dilutes and contaminates the engine oil, which reduces the oil’s ability to lower the engine temperature. The purpose of an oil cooler is to keep the engine oil temperature at a reasona