According to Sea Foam Sales Company, drivers should add Sea Foam Motor Treatment to their fuel tanks every 2,000 to 5,000 miles, for vehicles driven at least every two weeks. Owners who drive their vehicles less often should add the treatment with every new tank of gas.
The manufacturer claims that keeping Sea Foam in fuel tanks at all times keeps fuel systems clean. Customers can first add Sea Foam treatment to clean fuel systems and engines at a rate of 2 ounces or more per gallon of fuel. Afterward, customers can maintain the engine with subsequent applications of 1 ounce per gallon.