Specially formulated to fight the accumulation of harmful dirt, gum, and varnish deposits and water in the fuel system that can harm performance. STP Treatment used regularly: Cleans dirty carburetors. Cleans clogged fuel injectors. Reduces intake valve deposits. Helps keep combustion chambers clean. Help save gas by keeping carbs and injectors clean. Keeps intake manifolds clean. Removes water from fuel system to fight gas line freeze. Fights rush in fuel system. Will not harm catalytic converters.