13 Pound Turkey – Use 4 to 5 gallons of oil and cook for 44 minutes. 14 Pound Turkey – Use 5 gallons of oil and cook for 47 minutes. 15 Pound Turkey – Use 5 gallons of oil and cook for 50 minutes. 20 Pound Turkey * – Use 5 to 6 gallons of oil and cook for 3 minutes per pound.