Diesel D2

The quality of fuel and oil, of course, greatly affects the reliability and service life of an engine. In a diesel engine, this same relationship is expressed most severely: for high pressure and high loads determined. To counter them, the details should be lubricated with a high-quality oil. Here you can expect anything, including – and a sharp increase in pressure in the cylinder. And then even good oil will protect parts from wear and damage. So, to fuel for diesel requirements are as high than to oil.
The combustion in the cylinder of a diesel engine is most clearly characterized by the indicator diagram showing the dependence of the pressure in the cylinder from the crank angle. Type of indicator diagram depends on many factors determined by the engine design (type combustion chamber, injection pressure). performance (speed, temperature, angle of injection), a grade of fuel and its fractional composition.

Dependence of the viscosity of diesel fuel temperature.
Therefore, the most correct to apply the so-called depressor additives, especially in the off-season, when it is likely the lack of winter fuel at a gas station. We, unfortunately, there are cases where, despite the assurances of gas station workers that Winter Fuel in tanks still gets the summer or, at best, a mixture of summer and winter fuel. This is typical for the first few weeks of cold weather. So be careful not to get yourself unnecessary problems.
Sulfur, water, and mechanical impurities

The bulk of the fuel produced from sulfur crudes, as low-sulfur reserves are limited. When refining the principal amount of sulfur compounds distilled with factions, going for a diesel. Further reduction in the amount of sulfur in the fuel is complicated and expensive ways, basically, hydrotreating, so getting the low-sulfur fuel is difficult, and often not very profitable for the manufacturer. At the same time, the high content of sulfur significantly increases engine wear and fuel system corrosion due to sulfur, corrosive wear, and fast oxidation. Thus, according to statistics, an increase in the sulfur content from 0.2 to 0.5% (and 0.5% – a limit to GOST 305-82), engine wear increased by about 25%.
The sulfur content in diesel fuel abroad usually 0.05-0.1%, ie ten times less than in domestic.