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Automatic transmissions differ in a fairly wide range of designs: torque converter automatic transmission, continuously variable transmission (CVT), dual-clutch preselective robotized gearboxes (DSG, Powershift).

The operating principle of various automatic transmissions:

Torque converter automatic transmissions are classic 5-6 speed automatic transmissions, in which the fluid is circulated through channels by means of special valves (transmission solenoids) controlled by the transmission ECU. In turn, for the correct engagement of modes and gears, the electronic control unit receives signals from various sensors that inform the controller about the vehicle speed, engine load, accelerator pedal position, etc. For most torque converter automatic transmissions, Dexron IID or Dexron III level oils are recommended, namely Rosneft Kinetic ATF IID and Rosneft Kinetic ATF III.

CVT (Continuously Variable Transmission) consists of two pulleys mounted on the variator shafts and connected to each other by a belt or chain. Depending on the load and speed, the driving and driven pulleys change their diameter, as a result of which the torque on the wheels also changes.

Dual-clutch preselective robotized gearboxes are the most modern type of gearbox; in essence, it is a complex mechanical system with electronic control. It can be conditionally imagined that two manual gearboxes are placed in one housing at once. One gearbox has even gears, the other has odd gears, and each has its own separate clutch.

CVTs and dual-clutch preselective robotized gearboxes (DSG, Powershift) require oil with a special composition; as a rule, these are specialized products in the oil product line.

CVTs are more common among Asian equipment manufacturers, while DSG and Powershift are more commonly found in German-made cars.

The main selection criterion is the equipment manufacturer's recommendations. In some cases, the choice is limited to only one viscosity grade. However, often several viscosity grades are allowed for the consumer to choose from depending on the operating conditions. So, what is a "viscosity grade"? It is a characteristic of the low- and high-temperature properties of a transmission oil according to the SAE J 306 classification. For example, 80W-90, 75W-90, 85W-140. The first number, for example 80W, is a characteristic of the low-temperature properties of the transmission oil, where W stands for Winter. The lower the number, the better the low-temperature properties of the oil. The second number, for example 90 or 140, characterizes the viscosity at 100°C or, in other words, is responsible for the "thickness": the higher the value, the thicker the oil. When choosing a lubricant, it is necessary to take into account the ability of the oil to be pumped at low temperatures and at the same time provide an oil film at the operating temperature. In cold conditions, try to choose a product with better low-temperature properties.