1. Park the car on a flat, horizontal surface with a hard surface, firmly apply the parking brake. If the engine is cold, start it and warm it up at idle speed.
2. With the engine running, depress the foot brake pedal and move the AT selector lever through all positions in turn, finally returning it to the "P" position. Turn off the engine.
3. Unscrew the drain plug of the AT and drain some liquid into a previously prepared container. Collect some liquid in a glass container, such as a glass, and check the liquid for color, impurities, and the presence of a burning smell.
Note: When replacing the working fluid, the oil must be drained completely.
4. If the fluid is red, not cloudy and does not contain any particles, continue checking the condition of the transmission using special devices and testers according to the instructions for their use.
5. If the working fluid has changed color to brown or black, has become cloudy or has a burning smell, the authors of this Manual recommend disassembling the transmission to check the condition of the clutch and brake friction. The work should be entrusted to specialists.
6. If there are a large number of metal particles in the fluid, it is recommended to remove the transmission and install a new one or one that has undergone major repairs on the vehicle.
7. After checking the condition of the fluid and transmission, it is necessary to check the level of the working fluid and, if necessary, make the appropriate adjustments (see Chapter 1).
Source is on the website opelbook.ru

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