The increasing demand for the transport of goods by sea in this century has resulted in the construction of ever-increasing ships that require large and efficient diesel engines for propulsion. In order for the progress of internal combustion engines to be successful, it needs to be adequately designed for operating systems. For the progress of internal combustion engines to be successful, it its needed to adequately design their operating systems, one of those is the lubricating system. Lubrification reduces friction, noise, temperature and increases engine service life along with its elements. This final work describes two stroke slow-speed diesel engines lubrification system. The system mode, elements and characteristics are explained. Each individual lubrification system requires a different construction of the engine and its parts. The necessary elements are provided, it is explained where they are used and on what principle they work. Each individual part of the system must be optimally adapted for the lubrification system to function successfully.