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ST20 Sea Foam ST20 Truck and SUV Motor Treatment Additive, 20 oz Sea Foam works in fuel and oil systems to clean and lubricate critical engine areas. Made from petroleum ingredients, Sea Foam is safe and effective when used in any gasoline or diesel engine. Sea Foam 20 oz Truck & SUV size is great for treating larger vehicles. Just pour it in and go. for trucks and SUV's driven regularly, put 1 can of Sea Foam Truck & SUV in your fuel tank every 3,000 miles or 1 oz per gal. Gas additive. Diesel Additive. two cycle additive. Injector Cleaner. Oil Additive. Gas Stabilizer Cleans fuel injector and carburetor passageways Cleans intake valve and chamber deposits Lubricates upper cylinders Works in crankcase oil to liquefy harmful residues & deposits Stabilizes gas & diesel fuels up to 2 years for any gas or diesel fuel blend For all motor oils, conventional and synthetic