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Coolant In Engine Oil

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Cause Correction
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.
  1. Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not properly lubricate the crankshaft bearings and may lead to component damage. Refer to Lower Engine Noise, Regardless of Engine Speed .
  2. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block with low compression may indicate a failed cylinder head gasket.
Faulty external engine oil cooler Replace the components as required.
Faulty cylinder head gasket Replace the head gasket and components as required. Refer to Cylinder Head Cleaning and Inspection , and Cylinder Head Replacement .
Warped cylinder head Replace the cylinder head. Refer to Cylinder Head Replacement .
Cracked cylinder head Replace the cylinder head and gasket. Refer to Cylinder Head Replacement .
Cracked cylinder liner or engine block Replace the components as required.
Cylinder head, block, or manifold porosity Replace the components as required.
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