At certain temperature in diesel fuel crystals of paraffin which do fuel viscous so it cannot pass through the filter any more are formed. In this case say that fuel has thickened. To avoid increase in viscosity of fuel, you should buy at gasoline stations (gas station) fuel which corresponds to a season (summer or winter).

So, summer diesel fuel delivers you difficulties, for example, already at temperature more low–2 °C while winter fuel keeps fluidity up to temperature–15 °C. If at the gas station there is no winter fuel, it is possible to add in summer fuel special депрессорные additives (antigels) which lower temperature парафинизации approximately from–8 to–10 °C.

At operation of the car with the diesel engine at low temperatures there can be problems in following cases:

- The temperature falls more low–15 °C;

- You long did not go by the car, and then again began to maintain it, but in the winter while in a tank the fuel bought in the summer is filled in;

- You have bought diesel fuel at the gas station which yet has not passed to sale of winter fuel.