Fuel Cat removes and further prevents the build up of carbons, gums and waxes. Internally, your engine will be far cleaner and more efficient. It is particularly effective for injector needles, nozzles, valves, piston rings and oil contamination. After the first 2,000km of using Fuel Cat, the oil in your engine can become particularly dirty as it removes carbon deposits from the engine. All you have to do is change the engine oil, and thereafter it should stay noticeably cleaner for a longer period. By keeping your engine clean, Fuel Cat optimizes compression and seals the combustion chambers from the crank case, preventing contamination of the engine oil. Fuel Cat not only optimizes burning of fuel, but also keeps the engine clean by leaving no unburned fuel that can then turn into carbon.