the small bottle of seafoam is the IC5 Fuel Injector Cleaner, which is specially formulated to help clean fuel injectors and restore injector spray patterns for better engine performance. The 16 oz can of seafoam is the SF-16 Motor Treatment, which is a multi-use product that cleans fuel injectors, carburetors, intake valves, and combustion chambers, as well as lubricates upper cylinders and stabilizes fuel. Both products are safe for all types of gasoline and diesel engines, but they have different applications and concentrations