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There are different types of smoke that indicate the condition of the engine or indicate that there is a problem with the engine.

White / light gray smelly smoke: poor combustion due to low compression, too cold engine or late injection.

White vapor (not smelly): steam due to insufficient water injection at (high) engine load.

Bluish smoke: usually bad combustion due to excessive lubricating oil consumption, but can also be caused by poor compression or a closed crankcase breather.

Blue-gray smoke: May come from frequent idling of the engine.

Black smoke: poor combustion due to too much fuel and / or too little air. Can also occur with heavy engine load in combination with malfunctioning fuel injection equipment.

A malfunctioning fuel pump can also cause a smoking engine.

These smoke forms are an indication of a problem with the engine, but account must also be taken of, for example, the age and type of the diesel engine, the engine temperature, the outside temperature, the fuel used, the noise the engine makes, other complaints or incidents. etc. Fuel quality is also very important. At the next refueling, try to fill the empty tank with high-quality auto diesel (Shell V-power, BP Ultimate) at a car filling station, to see what the result is.