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It is recommended for the 2008 GMC Acadia to use a mixture of DEX-COOL antifreeze and 50% water in the coolant. This mixture should last for 5 years or 150,000 miles in most cases. If you find that you are losing coolant faster than that, there may be a leak in your system and you should have it inspected. To check your coolant levels, look at the clear coolant reservoir with a black cap. There should be markings for minimum and maximum levels. If the level is below the minimum line, add more coolant until it reaches the maximum level.
The 2008 GMC Acadia is designed to use Dex-Cool antifreeze/coolant as recommended by General Motors.
Dexcool, the coolant with an orange hue.