The transversion oil has a number of properties, but viscosity is one of the main features. It is from the viscosity that the work of all details of the transmission depends on the viscosity. The instruction to the car always has information about which viscosity of oil is best suited for the checkpoint. What kind of transmissive oil should be?
What kind of transmissive oil should be?
The spout oil is exposed to high pressure and operates at high slip rates and at different temperatures. Therefore, the quality of the transmission fluid is assessed according to stringent requirements.
The spate oil works in pretty "severe" conditions
The transmission oil, first of all, should be good for the details of the transmission and thus extend their service life. Opposite and tolerable oil properties will not allow the details to collapse sooner than time, and the anti-corrosion properties will keep them from corrosion, and the ability to push water away from rust. In addition, the transmission fluid should not destroy the rubber details of the system. Oil should also not oxidizes, change its properties at temperature changes.
Also, the fluid for transmission helps reduce the impact load on the parts, remove the excess heat generated by friction, and reduce energy costs.
What affects viscosity?
It is the optimal viscosity of the oil that affects its ability to lubricate both the surface of the mechanisms and the connection of the details between each other. In particular, the characteristics of the transmission, such as the speed of slipping and the load on the zoykill, are determined, the oil of which viscosity should be applied. Because when you increase viscosity, oil's lubricating oil can get worse.
Also viscosity affects the life of the details-the oil with the required viscosity significantly extends their life.
The correct viscosity of the oil can significantly extend the life of the transmission service
The oil with the required viscosity measures ensures that the car can be moved from a low air temperature, can reduce hydraulic losses and increase the transmission efficiency of the transmission and reduce fuel consumption.
If the characteristics of the oil viscosity are not suitable for the car, the details of the gearbox and the clutch are liable to be broken.
SAE viscosity classes
Of course, the viscosity of the oil directly depends on the temperature. The so-called viscoso-temperature properties of the transmission fluids are defined by SAE J 300 DEC 95. This classification was developed by the American Society of Automotive Engineers and is the one that adheres to many of the world's brands.
The viscosity of the oil, according to this classification, is defined in the conventional units, referred to as "viscosity levels".
The division of oil into the SAE classes is based on viscosity in low and high temperatures. When selecting the oil, account should be taken of the conditions under which the car is used and the highest and lowest temperatures will be.
What do you mean by viscosity?
The transmissions are divided into winter and summer.
Marking of winter classes-70W, 75W, 80W, 85W. W stands for "winters" (W). The lower the number, the fluid is temperamental, that is, the optimal viscosity at low temperature. For example, for oil 70W, the maximum temperature at which the liquid does not lose its properties, -50 ° C, and for oil 75W-40 ° C.
Summer classes are identified by the numbers 80, 85, 90, 140, and 250. The higher the metric, the higher the temperature of the liquid, the fluid will retain its viscosity properties.
The all-season oil is gaining in popularity. They are marked by double marking. For example, SAE 80W-90, SAE 75W-90.
The oil properties shall be determined in a laboratory-calculated viscosity at 100 ° C and the temperature at which the dynamic viscosity is not greater than 150,000 centipuise (s). The limits of the normal condition of the oil are important because when the viscosity changes begin to destroy the details of the transmission.
Can I mix?
Mixture of different SAE oils is not recommended. The balance of viscosity that the manufacturer has determined is broken, and there is no guarantee that the transmission will function properly. Before the new oil is filled, the details of the transmission are to be washed.
