Electro-hydraulically regulated diesel engines, i.e. ME engines as Man Energy Solutions calls them, do the following: The oil most commonly from the main engine's lubrication system is filtered and comes to the hydraulic oil supply unit where the pumps pressurize it to 300 bar. The oil goes further into the hydraulic cylinder unit and is used to drive the high-pressure fuel pump, exhaust valve actuator, and cylinder oil pump, and then returns to the tank. The aforementioned parts of the hydraulic cylinder unit, based on information from the crankshaft position sensor, are controlled by a cylinder control unit operated by the engine control unit, both of which are part of the engine control system. Injection of starting air in the cylinder is regulated by a solenoid valve. The RT-flex engines are controlled by the Wartsila Engine Control System-9520 which is compound of control modules that regulate fuel injection, opening and closing of exhaust valve and injection of starting air, based on information from the crankshaft position sensor. These elements are located on the fuel oil rail, servo oil and control oil. The oil pressure of 200 bar and the fuel oil pressure of 1000 bar are achieved by pumps which are part of the delivery unit. There is a special system for cylinder lubrication.