Question 392 · Car theory test
What does blue smoke coming from the vehicle's exhaust generally mean?
Pick an answer to test yourself.
Correct answer
The engine is burning oil.
Official explanation
A vehicle can give off blue smoke from the exhaust when it is burning oil. Poor maintenance and worn engines are typical causes. This blue smoke is harmful to the environment and may be costly. Drivers should have the vehicle checked by a competent person.
- Topic
- Vehicle maintenance
- Also in
- This question also appears in the motorcycle theory test.
Practise this topic in the app
Free demo questions for every topic, progress saved, a full mock exam in the official format.
Got it wrong, or had to think? That is one of 805 questions the car theory test can draw from. Sit the car mock exam in the official format (40 questions, 45 minutes, pass mark 35) and see how many more you would miss.
Related questions
- What should the driver be able to see in the vehicle mirrors when they are properly adjusted?
- What should the driver be able to see in the exterior mirrors of a vehicle when they are properly adjusted?
- What is the effect of a worn exhaust?
- What effect can a faulty exhaust system have?
- What is the purpose of a catalytic converter?
- Why should the valve be replaced when having a tubeless tyre fitted?