What does blue smoke emerging continuously from a vehicle exhaust tailpipe indicate?
Answer and explanation
Correct answer: D. Engine oil is burning inside the engine combustion chambers
- Step 1: Blue exhaust smoke meaning. Step 2. Blue smoke means motor oil is entering combustion chambers (worn piston rings or valve stem seals). Answer: Engine oil is burning inside the engine combustion chambers. Why not the others: Coolant produces white sweet-smelling vapor; DPF regen produces occasional heat/odor, not blue oil smoke; fuel octane does not produce blue smoke.
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