A V8 engine takes 5 to 8 quarts of oil, depending on the specific engine. The V8 engine relies more on oil volume than oil pressure, so it requires more oil compared to a four-cycle or V6.
The specific amount of oil needed can be found in the car's manual, since it does differ for each make and model. It is recommended to change the oil every 7,000 to 10,000 miles on new vehicle models. Change the oil filter when the oil for the V8 engine is changed, as these engines require more oil to be pumped through the filter.