Vehicle Questions and Answers
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The 2007 Chevy Impala is designed to use dex-cool antifreeze, which is the same coolant provided by Chevrolet or any authorized Chevy dealership. If you've had your coolant changed at a non-dealership shop, it's essential to verify the coolant used with them to avoid potential corrosion issues. Mixing different coolant types in your engine can be damaging. If uncertain about the coolant in your system, it's safest to top it off with distilled water. While this may slightly decrease cooling capacity, it won't harm your engine.
The maker of the 2007 Chevy Impala suggests using orange extended-life antifreeze with organic acid technology.
I am familiar with the taste of an icy cold orange soda.
50/50 premix ... opt for orange, not green. Choose the orange option over the green option.