Caution: Under some conditions, Ethylene Glycol in engine coolant is flammable. To avoid being burned when adding engine coolant, do not spill it on the exhaust system or on hot engine parts.

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).

GM Goodwrench DEX-COOL™ (GM Specification 6277M) is a newly developed engine coolant that is designed to last for 241,350 km (150,000 miles) or 5  years, whichever occurs first. Follow the instructions in Draining And Filling The Cooling System in this section. Ensure that only GM Goodwrench DEX-COOL™ is used when you add or change the coolant.

A 50/50 mixture of ethylene glycol (DEX-COOL™) and clean drinkable water will provide the following benefits: