For 1990-2009 cars

### Removal Procedure

1. Remove the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.
2. Remove the oil level indicator.
3. Remove the oil level indicator tube.

If you are unable to remove the oil level indicator tube, perform the following steps:

3.1. | Remove the stud in order to allow for lateral movement of the oil level indicator tube.

3.2. | Apply penetrating oil to the bottom of the oil level indicator tube.

3.3. | Move the oil level indicator tube back and forth in order to loosen the oil level indicator tube.

### Installation Procedure

1. Clean the oil level indicator tube.
2. Apply GM sealant P/N 12345739 or equivalent around the oil level indicator tube 12.7 mm (0.50 in) below the bead.
3. Install the oil level indicator tube into the engine block.
4. Install the oil level indicator.
5. Install the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.