Give your fuel system the care it deserves with STP Gas Treatment, a fuel additive that improves the quality of gasoline in your tank and helps maintain your engine’s fuel efficiency. This fuel treatment is compatible with all gasoline engines, including cap-less gas systems. Expertly formulated with powerful cleaning agents, the fuel cleaner fights the build-up of harmful carbon, gum, and varnish deposits in the fuel system. The gas additive works as a fuel system cleaner to keep fuel injectors and intake valves clean of deposits. It’s also engineered to remove water from the fuel system and prevent fuel lines from freezing in cold weather. Over time, you can save gas by using a gas cleaner like STP Gas Treatment to keep your gasoline and fuel system clean. Use the gasoline additive regularly when you fill up your tank. Simply pour the entire contents in your gas tank before or after fueling. One 5.25 fl oz bottle treats up to 15 gallons of gasoline. Go farther on every tank with STP Gas Treatment.