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Dave wrote:
I have just been watching them and a thought crossed my mind.

How do they stop the diesel from going solid in the tanks and pipes?

I recall seeing additives that would prevent this happening.

Correct. Though locally-supplied fuel is likely to be formulated for
the local needs. If the engine's allowed to stop, and the whole
vehicle gets cold it's likely to be a case of having to use a blowtorch
on the fuel tank and fuel lines in order to get going again.