The TUNAP 957 microflex® Engine Interior Cleaner is a high-performance solution designed to thoroughly clean the engine's internal oil circuit. It effectively removes operational residues, such as black sludge and carbon deposits, ensuring optimal engine performance and extending the lifespan of the fresh engine oil. This cleaner is formulated to be compatible with all common engine oils and is suitable for both gasoline and diesel engines. Its advanced formula helps to free up sticky piston rings and hydraulic valve lifters, improving compression and reducing noise. The 200 mL bottle is sufficient for up to 6 liters of engine oil.