Adding Coolant

NOTE: When adding coolant, it Is important that you use GM Goodwrench DEX-COOL TM (orange-colored, silicate-free) coolant meeting GM Specification 6277M. if silica the coolant is added to the system, premature engine, heater core or radiator corrosion may result. in addition, the engine coolant will require change sooner - at 50,000 km (30,000 miles) or 24 months.