STP gas (petrol) treatment improves the quality of gas by adding powerful cleaning agents that help fight the accumulation of harmful carbon, gum, and varnish deposits in the fuel system that can reduce performance. Boost the cleaning performance of gas, save gas by keeping fuel intake system clean, fight fuel line freeze by removing water. This product is made with jet fuel, a high carrier of active ingredients. Safe for all gasoline engines. Use regularly when you fill up. 5.25 fl. oz. (concentrated).