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Is it normal for diesel engines to emit black smoke?

April 26, 2017Black diesel emit engines normal smoke

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Is it normal for diesel engines to emit black smoke?

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No. New clean diesel engines do not smoke and have been designed to be smoke free since 1994. When a diesel engine emits excessive smoke, it means that it is out of tune, in need of maintenance or not operating efficiently. Black smoke is caused by unburned fuel and indicates wasted energy and money for the operator. It is in the owner’s interest to take corrective action quickly.