Good Evening, originally your vehicle came with dexcool antifreeze. However if you are not the original owner and they did work to it you may just want to check the color of the antifreeze to know which one to get. If it is green it is your standard antifreeze, if it is clear change it immediately because it is water and you really do not want it to freeze, if it is a orangish color it is dexcool. And if it is brown someone mixed dexcool and the standard antifreeze and I would recommend a flush and refill. There are varying thoughts on dexcool and a lawsuit going in california against it so you might look into that and make your own decision from there. Hope this helps.
DEX-COOL® is an ethylene-glycol coolant that was developed to last for 150,000 miles (240,000 km), or 5 years, whichever occurs first. It is recommended that only DEX-COOL® be used when coolant is added or changed. It's a good idea to purchase a gallon container or two of DEX-COOL® from an authorized GM dealer so the correct antifreeze is always available. A 50/50 mixture of this ethylene-glycol coolant and water should be used, providing freezing protection down to -34°F (1°C), boiling protection to 265°F (265°C), and rust and corrosion protection for the system. A solution stronger than 70% antifreeze is not recommended and pure antifreeze will freeze at only -8°F (-22°C).
2000 uses orange gm dex-cool, available at any local wal-mart, or parts house
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