I want to change it myself.
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2007 Pontiac G6 Question: What type anti freeze fluid do I need for my G-6 and how many quarts are needed
milesauto from Miles Auto Service Inc., July 18, 2012, 08:25Master
The cooling system in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL extended life coolant.
A 50/50 mixture of clean, drinkable water and DEX-COOL coolant will:
Note: We use distilled water to mix with the antifreez. Tap water can cause problems. Need to know engine size to give you capacity of your system.
Answer #2ziptie12 July 18, 2012, 10:56Master
Owners manual under fluid specifications and/or capacities.As the other answer states use distilled water or 'pre-mixed' DEX-COOL.