Video tutorial on how to apply Sea Foam in your petrol/gas/gasoline/4 stroke engine. Sea Foam is a type of fuel system, intake, and combustion chamber cleaner which removes any residue or debris build up internally from an engine that can cause running issues. These issues can consist of hard starts, poor fuel economy, lack of performance, rough idling, etc. Sea Foam is intended to clean any carbon build up, reduce sticky injectors, clean other engine components internally, etc. From my experience, the car does idle and run much better. Unfortunately I haven't experienced any noticeable change in fuel economy. Results will vary though, depending on your vehicle. This particular tutorial was done on a 2000 Subaru Outback 2.5L opposed 4 cylinder EG25.