Cause | Correction |
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DEFINITION: Foamy or discolored oil or an engine oil overfill condition may indicate coolant entering the engine crankcase. Low coolant levels, an inoperative cooling fan, or a faulty thermostat may lead to an overtemperature condition, which may cause engine component damage. Contaminated engine oil and oil filter should be changed.
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Faulty cylinder head gasket | Replace the head gasket and components, as required. Refer to Cylinder Head Cleaning and Inspection and Cylinder Head Replacement - Left Side or Cylinder Head Replacement - Right Side . |
Cracked cylinder head | Replace the cylinder head and gasket. |
Improper sealing of exhaust valve guide-to-cylinder head | Replace the cylinder head and gasket. |
Cracked cylinder liner or engine block | Replace the components, as required. |
Cylinder head, block, or manifold porosity | Replace the components, as required. |
Warped cylinder head |
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Faulty external engine oil cooler | Replace the components, as required. |