XERAMIC INTERNAL ENGINE CLEANER cleans the internal part of the engine from sludge, gum, rust and varnish build-up. Helps loosen stuck valves and piston rings. Increases compression and improves engine performance. Reduces the emission of harmful exhaust gases and lowers fuel consumption. Harmless to metal parts. Suitable for up to 4 liters of engine oil. Can be added to mineral, synthetic or semi-synthetic motor oil.