by It is most correct to choose the brand of lubricant based on the brand previously used in the engine. For example, if 10W40 oil (diesel) was previously used, you should continue to use this brand. Exceptions include cases where engine wear exceeds 25%. In this situation, a more viscous liquid is needed.
Differences in Diesel Oil
There are numerous differences between diesel fluid and similar material for gasoline internal combustion engines. Firstly, this is due to differences in the operation of the power units themselves:
- the fuel-air mixture in a diesel engine is leaner;
- diesel heats up more;
- the process of forming a combustible mixture occurs much more intensely;
- there is more soot in the exhaust gases;
- there is more sulfur in the diesel fuel;
- the pressure in the combustion chamber is noticeably higher.
Due to these features of engine operation, there is accelerated aging of the lubricant, faster oxidation, and loss of cleaning and protective properties.
Therefore, the choice of lubricant for diesel largely determines its lifespan and operational stability.
Which Option to Choose?
Like supplies for gasoline engines, lubricants for diesel engines are marked with two numbers, according to viscosity class.
For example, 5W30 or 10W40. The first number indicates several parameters:
- speed of circulation through channels;
- speed of delivery to friction parts;
- battery charge consumption;
- degree of resistance to starter shaft rotation.
The lower the first number, the less viscous the oil. The second number determines the high-temperature viscosity class. In other words, viscosity after the engine reaches operating temperature.
There are also so-called universal fluids that can be used in both diesel and gasoline engines. However, one should be cautious when using such oils: most are recommended for use in one type of engine or the other.
The SJ/CF marking indicates a preference for gasoline engines, while CF/SJ is for diesel engines.
