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Coolant in engine oil (A20NFT/LHU)

Coolant in engine oil (A20NFT/LHU)


Cause Procedure
DEFINITION: Foam formation in engine oil or discoloured oil or "oil level too high" may indicate that coolant has entered the crankcase. Low coolant level, faulty cooling fan or a defective thermostat may lead to a condition with high temperature which could cause damage to engine components. Contaminated engine oil and the oil filter must be changed.
1. Check the oil with regard to foam formation and "oil level too high". If coolant is mixed into the engine oil, it may mean that the crankshaft bearings are not sufficiently lubricated, which may result damage to certain engine parts. Information is available in Noise lower part of the engine, regardless of engine speed (A20NFT/LHU) .

2. Check using a cylinder leakage test. During this test, a heavy formation of air bubbles in the coolant system indicates a defective gasket or a damaged component.

3. Check using a cylinder compression test. Two cylinders "side by side" on the engine block with low compression may indicate a faulty cylinder gasket. See Compression test engine .


Faulty cylinder head gasket Replace the cylinder head gasket and components if necessary. Information is available in Cleaning and checking the cylinder head A20NFT/LHU) and Cylinder head, A20NFT/LHU .
Warped cylinder head Replace the cylinder head and gasket. Information is available in Cleaning and checking the cylinder head A20NFT/LHU .
Cracked cylinder head Replace the cylinder head and gasket. See Cylinder head, A20NFT/LHU and Cylinder head, gasket .
Cracked cylinder liner Replace the components if necessary.
Porosity in cylinder head or block Replace the components if necessary.