Read carefully other cautions on side panel. Trusted by mechanics since 1942. For all gasoline cars & trucks over 75,000 miles. Safe & easy to use. For all gasoline cars & trucks over 75,000 miles. Safe & easy to use. Sea foam high mileage motor treatment is a blend of cleaning and lubricating petroleum ingredients that can be used safely in all types of 2- & 4 - stroke gas engines, all types of gasoline fuel and ethanol blends, and all types of motor oils (both conventional and synthetic). use sea foam high mileage to help minimize long-term wear and prevent rough engine performance in vehicles over 75,000 miles. Add to gasoline fuel: just pour sea foam high mileage in your fuel tank to clean and lubricate your entire fuel system. It works through fuel injectors and carburetors to remove harmful residues and deposits from fuel passageways, intake valves, pistons and chamber areas. Direction: for regular fuel system maintenance, add 1 ounce per gallon. When a greater cleaning concentration is needed, use 2 or more ounces per gallon. For 2-stroke pre-mix add 2 ounces per gallon. Add to crankcase oil: sea foam high mileage helps keep your engine running clean by removing harmful oil residues and deposits that can restrict oil flow and engine lubrication. Directions: add 1 ounce for each quart of oil the crankcase. For cleaning upper engine deposits (carbon & fuel residues), use sea foam spray top engine cleaner & lube (SS14). Treatment recommendations: autos & trucks: add to fuel every 3,000 miles. For best results, add whenever you refuel. Older small engines: add whenever you refuel. Crankcase oil: add to oil 100 to 300 miles before every oil change. A cleaner fuel system and oil crankcase will help your engine: start easier. Run smoother. Last longer. Please recycle this can when empty.