Correct answer
Burning oil and possible abnormal lubricant consumption.
That oil is being burnt and oil consumption may be abnormal. Smoke is a reason to check the level and obtain a diagnosis; it alone does not identify the failed component or quantify a major loss. Do not confuse it with cold-start condensation vapour or other smoke with different causes.
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Burning oil and possible abnormal lubricant consumption.
That a dirty air filter necessarily produces blue smoke without burning oil.
That all blue smoke proves only increased diesel consumption.
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