This is a product to clean inner surfaces of the engine from thick dirt, deposits, rust and scale before the oil change. It dissolves dirt on the pistons and rings. It cleans sticky valves and lifters. It keeps deposits and sedimentation suspended until they are drained with oil. It comprises anti-wear, anti-corrosive and anti-oxidative additives which protect the engine during its flushing. It improves engine operation, extends its service life and saves fuel. It helps restore compression.