For 1990-2009 cars

1. Install a new gasket.

Apply sealer GM P/N 12346141, Canadian P/N 10953433 to the joint on the oil pan rail where the main bearing cap meets the engine block (two locations).

2. Install the oil pan.
3. Install the oil pan retaining bolts.

Tighten
Tighten the retaining bolts to 25 N·m (18 lb ft).

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.

4. Install the oil pan side bolts.

Tighten
Tighten the side bolts to 50 N·m (37 lb ft).