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The Dex-Cool coolant is compatible with most General Motors vehicles, including the 2004 Chevrolet Tahoe. It is widely recommended by major auto part stores and is more affordable than OEM options. It is crucial not to mix different types of coolant. If you are uncertain about what coolant is in your '04 Tahoe, it is advisable to perform a complete coolant replacement instead of adding small amounts of a different type. Mixing a significant amount greater than 15 can result in severe issues, possibly causing engine failure.
A 2004 Chevy Tahoe utilizes Prestone's 1 gallon yellow coolant/antifreeze mixture in a 50/50 ratio.
I tried out the peak 50/50 and it totally does the job.
Thanks a lot