When using diesel fuel with manufacturer-guaranteed antifreeze properties and with a heated diesel filter (if installed), the additives remain effective up to the guaranteed temperature.
At low temperatures, the fluidity and filterability of diesel fuel are insufficient (paraffin precipitation).
Therefore, in the winter months, diesel fuel grades with improved temperature properties are sold. When the cold season comes, fill up with winter grades of fuel.
To maintain the fluidity and filterability of summer grades of fuel at low temperatures, it is necessary to mix the following into the fuel tank in quantities corresponding to the outside temperature:
- kerosene for engines or
- regular unleaded gasoline for internal combustion engines, or
- fuel additives (thinners)
ATTENTION: It is impossible to dissolve the fallen paraffin.
Kerosene for engines or regular lead-free gasoline can be mixed in up to 30%.
At very low temperatures, also mix additives into winter diesel fuel.
WARNING: Gasoline is flammable and explosive. Even small additives increase the risk of explosion. Therefore, follow the recommendations for filling.
Remember that when using thinners:
- engine power does not decrease;
- it is possible to use the car even at very low temperatures.
If the engine does not start due to thickened diesel fuel, tow the car to a garage. Warm up the fuel filter in a hot water bath.
| Outside temperature°C | Summer diesel fuel % | Additives % |
| from 0 to -9 | 80 | 20 |
| -10 to -14 | 70 | 30 |
| Outside temperature°C | Winter diesel fuel % | Additives % |
| -15 to -25 | 70 | 30 |