Is 5 quarts of oil not enough for a 5.3 liter V8 Engine?

Yes, 5 quarts of oil is almost certainly not enough for a 5.3 liter V8 engine. While the exact oil capacity varies slightly depending on the specific make and model of the vehicle, 5.3 liter engines typically require 5 to 6 quarts, sometimes even a little more. Running the engine low on oil can cause serious damage. Always consult your owner's manual for the precise oil capacity for your vehicle.