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Hi Kevin, thank you for the question! How often you add Sea Foam to fuel depends on how often the engine is used:
For cars and trucks driven regularly, put 1 to 2 cans of Sea Foam in your fuel tank every 3,000 miles.
For engine equipment used regularly, add 1 oz of Sea Foam per gallon to a fresh tank fill every 3 months or sooner.
For all other engines and fuel tanks that are not used regularly, add Sea Foam to every tank of fuel.