Fights deposit buildup & engine friction! Helps maintain engine efficiency! 1 bottle = 1 use. Treats up to 21 gallons. Choose the STP products that are right for you, to help - maintain engine efficiency. America's leading fuel additive maker! Use regularly when you fill up. STP Fuel Injector & Carburetor Treatment helps: maintain optimum engine efficiency; fight friction on piston rings/cylinder walls; save gas by keeping injectors and carburetors clean. STP does not manufacture any private label products. Questions or Comments? 1-888-Go4-Stp1 in the USA. www.stp.com. Made in the USA.