Coolant

This vehicle has a newly developed engine coolant. GM Goodwrench(R) DEX-COOL(R) was developed to last for 240,000 km (150,000 miles) or 5 years, whichever occurs first. Follow the instructions in Draining and Filling Cooling System. Make sure only GM Goodwrench(R) DEX-COOL(R) (silicate-free) or Havoline DEX-COOL is used when coolant is added or changed.
A 50/50 mixture of DEX-COOL(R) and water will provide the following protection:

Notice: Pure coolant can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent, as the freeze level rises rapidly after this point. Pure coolant will freeze at -22°C (8°F).
- Give freezing protection down to -37°C (-34°F).
- Give boiling protection up to 129°C (260°F).
- Protect against rust and corrosion.
- Help keep the proper engine temperature.
- Let the warning lights and gauges work correctly.