The oil pump sucks engine oil from the oil pan through the mesh filter and forces it into the main oil line through the oil filter. There is a pressure relief valve on the pressure side of the oil pump.
If the oil pressure is too high, the valve opens and some of the oil can drain back into the oil pan (see illustrations 9.0).
Through the central hole of the filter element, filtered oil enters the pressure lubrication line. If the oil filter is clogged, unfiltered oil is directed into the pressure line through the bypass valve.
From the pressure lubrication line, oil flows through the pressure channels to the crankshaft bearings.
Through the inclined holes in the crankshaft, oil gets to the connecting rod bearings and from there is splashed onto the piston pins and the pistons themselves.
At the same time, engine oil enters the cylinder head through the injection lines to the camshaft bearings and valves of the valve timing mechanism (see illustration 9.0).
In diesel engines, as well as in A 190 vehicles, engine oil cooling is performed using an additional oil cooler. This oil cooler is attached to the oil filter flange and is included in the coolant circulation circuit.
Oil consumption
Oil consumption in internal combustion engines refers to the amount of oil produced as a result of the combustion process.
In no case should oil consumption be equated with oil losses that occur as a result of leaks due to leaks in the oil pan, cylinder head cover, etc.
Publication taken from an online resource [Mercedesman.ru]
Normal oil consumption occurs as a result of the combustion of small quantities of oil in the cylinders, the removal of residual combustion products and particles formed as a result of friction.
In addition, oil is consumed by the high temperatures and high pressures to which it is constantly exposed in the engine.
In addition, the degree of oil consumption is also affected by external operating conditions, driving mode, and operating tolerances. Oil consumption should not exceed 0.8 liters per 1000 kilometers.
Caution! Do not fill the oil above the maximum mark on the tank. If too much oil was poured during refueling, remove or drain the excess. Otherwise, unburned oil entering the exhaust system may damage the catalytic converter.