EACH 5 1/4 fluid ounce BOTTLE TREATS UP TO 21 gallons OF GAS IN YOUR CAR OR TRUCK. THIS CLASSIC STP PRODUCT IS MADE WITH JET FUEL, A HIGH-QUALITY CARRIER OF ACTIVE INGREDIENTS. JUST POUR ENTIRE CONTENTS OF ONE BOTTLE INTO GAS TANK THAT IS AT LEAST HALF FULL, ONE BOTTLE TREATS 21 GALLONS, AND YOU CAN USE THIS WITH OTHER STP FUEL ADDITIVES.
