Coolant: Description and Operation

This vehicle has a newly developed engine coolant. GM Goodwrench(R) DEX-COOL(R) was developed to last for 240 000 km (150,000 mi) 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(R) DEX-COOL(R) is used when coolant is added or changed.
A 50/50 mixture of DEX-CO0L(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 -220°C (-8°F).
^ Give freezing protection down to -371°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.