Composition for cleaning the oil system of gasoline and diesel engines in cars operated under difficult conditions of urban traffic, with extended maintenance intervals or when changing the type of oil. The increased content of detergents ensures effective removal of complex lacquer deposits. • Effectively and safely removes oil and engine wear decomposition products • Prevents carbon build-up on piston rings under harsh operating conditions • Increases the service life of new oil by 10-20% by reducing the non-drainable residue by more than 2 times • Prevents hydraulic lifter sticking • Does not clog the oil pickup and channels of the oil system • The composition is safe for seals, gaskets, and the paintwork of the oil pan • Compatible with all types of motor oils • Recommended for systematic use during every maintenance check-up