For 1990-2009 cars

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Place a drain pan or a suitable container under the transaxle.
3. Remove the transaxle oil level and/or the filler plug (1) from the transaxle.
4. Use a 10-mm hex-head socket or a wrench in order to remove the transaxle drain plug (2) from the transaxle.
5. Drain the transaxle oil.
6. Apply some GM P/N 12346004 or the equivalent to the threaded portion of the transaxle drain plug (2).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

7. Install the transaxle drain plug (2) into the transaxle.

Tighten
Tighten the transaxle drain plug to 21 N·m(15 lb ft).

8. Add approximately 2.4 liters (2.5 qt) of transmission fluid into the transaxle filler plug hole. Use GM Goodwrench Synthetic Manual Transmission Fluid, P/N 12346190, or an equivalent gear oil with the SAE lubricant scale of 75W-90 GL-4.

The oil level should be even with the bottom of the transaxle oil level and/or of the filler plug hole.

9. Apply the GM P/N 12346004 or the equivalent to the transaxle oil level and to the filler plug.
10. Install the transaxle oil level and the filler plug (1) into the transaxle.

Tighten
Tighten the transaxle oil filler plug to 21 N·m (15 lb ft).

11. Remove the drain pan from under the transaxle.
12. Lower the vehicle.