Every engine uses oil. bus diesel engine "Volkswagen" consumes up to 0.5 liters of oil per 1000 kilometers. The engine wear limit is reached at a flow rate exceeding 1 liter per 1000 km.
Depending on the temperature, any oil tends to reduce its viscosity. As the temperature rises, it becomes liquid. This adversely affects the adhesion and resistance to compression of the lubricating film. When cold, the oil becomes thick to viscous, its fluidity decreases, and the internal frictional resistance increases. These properties of the oil require the use of such motor oils, the viscosity of which is affected by temperature changes to the least extent.
When the engine is cold, the oil must still be so thin that it does not impede the operation of the starter too much and that it reaches all lubrication points as quickly as possible from the moment of starting.
The viscosity of an oil is equivalent to its internal friction and is indicated by the SAE system, for example, SAE 30, SAE 10, etc. Large values indicate thick oils, low values indicate thin oils. But the viscosity of the oil does not allow us to draw any conclusions about its lubricating properties.
for buses "Volkswagen" narrow and wide range oils can be used. Wide range oils have the advantage that they do not need to be adapted to temperature conditions (summer Winter). Wide range oils are based on a single fluid narrow range oil (e.g. 10W). With the help of a so-called thickener, the oil is stabilized when hot, so that the required lubricity is ensured for each operating mode. If a wide-range oil is used, then modern oils with a large viscosity range should be used, for example, 15 W-40, 20 W-50. "W" indicates the suitability of the oil for winter conditions.
Speaking of low-viscosity oils, they mean wide-range oils, to which, along with others, substances are added that reduce the coefficient of friction, which makes it possible to save fuel up to 3 percent. When buying a low-viscosity oil, you need to make sure that it meets the standards of the concern "Volkswagen".
In principle, only HD oils are permitted for use with bus engines. These are alloyed oils, the lubricating properties of which are significantly improved by the addition of various active substances. These additives provide better corrosion and oxidation protection, reduce crankcase sludge formation, and have cleaning and dissolving properties. Cleaning and solvent additives not only reduce the formation of carbon deposits in the engine, but at the same time they have the ability to dissolve deposits that are removed with the oil when changing the oil.
In countries where the API engine oil designation system has been adopted, HD oils suitable for use in 8 bus engines are designated "CD".
For models "Audi" "Volkswagen" set standards for oil. Only oils meeting these standards should be used. The designation of the standard is on the oil box.
For naturally aspirated engines (50 l. s., 57 hp.) engine oils VW 501 01, VW 505 00, API-CO or low-viscosity oils according to VW 500 00 can be used.
For turbodiesels, only VW 505 00 oils can be used. ACI-CD engine oils can only be used for topping up if VW oil is not available. Low-viscosity oils complying with the 505 00 standard are not suitable for a turbodiesel. Due to the higher power, the engine oil is subjected to greater thermal and mechanical stresses here. A piston, for example, becomes so hot that it must be cooled by directional oil injection. In addition, an additional circulation circuit is required to not only lubricate the very hot bearings of the gas turbocharger, but also to cool them.
for buses "Volkswagen" oils of the following viscosity grades can be used (B25-141):
Since the application ranges of the adjacent SAE oils in the table overlap, short-term temperature fluctuations may not be taken into account when choosing an oil. It is allowed to mix oils of different viscosities if you need to add oil, and the ambient temperature no longer corresponds to the viscosity of the oil in the engine.
At prolonged temperatures below -20 degrees. WITH (arctic regions) it is recommended to use oil SAE 5 W-30 or SAE 10 W.
When using oils SAE 10 W or SAE 5 W-30, prolonged operation of the engine at high speeds and constant heavy loads should be avoided if the temperature rises and goes beyond the limits given in the table.
Attention! Wide range oils W W-50 must not be used!
Active lubricating additives of any kind must not be mixed with fuels or lubricating oils.
Visitor comments