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C1Difficulty 2/5

Coolant is found entering the oil in a liquid-cooled engine. Which of these internal faults can allow that mixing?

Correct answer

A damaged cylinder-head gasket allowing the circuits to communicate.

A damaged cylinder-head gasket may fail to seal passages correctly and allow coolant into the oil. This is a possible cause to confirm by diagnosis, rather than an automatic conclusion from any water presence. Correct the problem before continuing to use the engine, because contamination can impair lubrication.

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  • Tyre pressure below the specified value.

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  • A damaged cylinder-head gasket allowing the circuits to communicate.

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