As a fuel additive, pour 1 oz. of liquid into your fuel tank per 1 gallon of fuel. For engine cleaning, slowly pour small amounts into the vacuum line, fuel line or air intake system of gasoline engines at operating temperature – DO NOT pour liquid into Diesel Engine air intake systems. For oil treatment,  add 1.5 oz. of liquid per 1 qt. to oil crankcase. For additional applications, consider using the Sea Foam Spray, to access hard to reach parts of the engine.