With low temperatures, diesel fuel can form some solidified paraffin suspensions which can clog the fuel filters; making the normal engine supply impossible.
Fuel as per European standard EN590 guarantees fluidity up to 0°C during the summer period, and up to -20°C during the winter period.
There is a special type of fuel for countries subject to very low temperatures.
Do not add petrol to fuel, in order to avoid serious engine damage.
For further information on use and maintenance, please refer to the manufacturer’s manual.