Your diesel engine does not start in winter. What can be the reason for this?

The issue of a diesel engine not starting in winter can indeed be attributed to multiple factors, particularly involving the type of fuel used. When summer diesel fuel is left in the tank, it may not have the necessary properties to perform well in colder temperatures, as diesel fuels can gel in lower temperatures or not ignite properly when colder weather hits.

In addition to the fuel characteristics, the condition of the ignition system is important. In diesel engines, while they do not use spark plugs in the same way that gasoline engines do, they do require a functioning glow plug system to preheat the combustion chamber. If the glow plugs are not functioning correctly, this can also prevent the engine from starting.

Therefore, considering both the fuel type and the condition of the ignition system is essential. Selecting all relevant options when answering helps in diagnosing the actual problem accurately, which is crucial for safe operation of the vehicle according to German traffic regulations. Ensuring your vehicle is properly maintained and fueled for seasonal conditions is a part of responsible vehicle ownership under these laws.