GM Service Manual Online
For 1990-2009 cars only

When adding or changing the transmission fluid, use only the recommended automatic transmission fluid. Refer to Transmission General Specifications.

Important: Do not overfill the transmission. Overfilling will cause aeration of the fluid, loss of fluid, shift complaints and possible damage to the transmission.

Fluid Color

Transmission fluid is red in color when new due to a red dye that is added so it can be distinguished from other oils and lubricants. The red dye is not permanent and is not an indicator of the quality of the fluid. As the vehicle is driven, the transmission fluid will quickly begin to look darker in color and will then appear to be a light brown. A dark brown color with a distinctively burnt odor may indicate fluid deterioration and a need for the fluid to be changed.

Important: If a dark brown fluid color is observed coupled with a reported delayed shift pattern, this may only indicate that the fluid requires replacement and is not a definite indication of a potential transmission failure.

Fluid Level

Important: As the temperature of the transmission fluid greatly affects the fluid level, this operation must only be carried out with the transmission at normal operating temperature (82-94°C). If the transmission is not at normal operating temperature and the correct procedure is not followed, the result could be a false reading of the fluid level on the transmission fluid indicator.

  1. Drive the vehicle for a distance or at least 25 km to bring the transmission up to normal operating temperature.
  2. If the vehicle has been operated under the following conditions, switch the engine off and allow the transmission to cool for approximately thirty minutes.
  3. • In high ambient temperatures above 32°C
    • At sustained high speeds
    • In heavy city traffic during hot weather
    • Towing
  4. Park the vehicle on level ground.
  5. Move the gear selector to the Park position and the apply park brake.
  6. Allow the engine to idle for 3 minutes with the accessories turned off.
  7. Lift the locking lever on the transmission fluid indicator, remove the transmission fluid indicator and check fluid color, condition and level.
  8. If the transmission fluid level is low, add only enough of the recommended fluid to bring the level into the hot area.