We need to know the year make and model of your car or truck. It could be 3.5 quarts to 5 gallons when the oil filter is changed. Call the dealer of the car or truck.

The correct amount of oil to be considered "full".

O.K I give up what is the oil capacity

Right

Somewhere between a pint and a barrel.

Twice as much as half full.

That depends on what motor you have.