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As an American, I would say: The coolant capacity for a 2004 Chevy Silverado 5.3 is 6 quarts. It is recommended to replace the coolant for the engine at either 100,000 miles or after ten years. Over time, the engine coolant loses its ability to protect against corrosion and to lubricate properly. This can lead to radiator corrosion, causing rust buildup that you definitely want to avoid in your car's radiator and engine. If you notice coolant leaking under your car or hear a grinding engine noise, these are signs that a radiator flush is needed right away. Other indicators of a problematic cooling system include a smell of antifreeze or the car overheating too easily.
Eighteen quarts, which is equivalent to 4.5 gallons.
The 2004 Chevy Silverado 5.3 has a coolant capacity of 6 quarts.