For 1990-2009 cars

This vehicle is equipped with a long life coolant. Use only the orange colored, silicate free GM Goodwrench DEXCOOL™ when adding or replacing the coolant. If any other coolant is used, the coolant will require a change much sooner at 50 000 km (30,000 mi) or 24 months. Use engine coolant supplement sealant pellets GM P/N 3634621 or equivalent when coolant is replaced. Refer to Cooling System Draining and Filling for the coolant replacement procedures and the maintenance intervals.