Irish Driver Theory Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What does blue smoke from a vehicle's exhaust generally indicate?

The engine is overheating

The engine is burning oil

Blue smoke from a vehicle's exhaust typically indicates that the engine is burning oil. This phenomenon occurs when oil enters the combustion chamber and is burned along with the fuel. The presence of blue smoke can be a sign of worn engine components, such as piston rings, valve seals, or cylinder walls, which can allow oil to escape into the space where fuel is ignited. This not only impacts the engine's efficiency but can also lead to further mechanical problems if not addressed.

While other options, like overheating or needing servicing, may present with different symptoms, and a fuel leak might result in black smoke, blue smoke specifically points to oil-related issues within the engine.

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Fuel is leaking

The vehicle needs servicing

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