Behind the oil filter is a relief valve that maintains the oil pressure at approximately 4 bar. At higher oil pressure, the valve opens and some of the oil can flow back into the oil pan.
Channels for lubricating the crankshaft bearings depart from the main oil line. Through inclined drillings in the crankshaft, oil is directed to the connecting rod bearings, and from there it is sprayed onto the piston pins and cylinder walls.
At the same time, oil is supplied through the intake pipes to the cylinder head to the camshaft bearings, gap compensators in the valve drive (hydraulic pushers) and valve guides. The presence of check valves in the line always ensures that there is enough oil to lubricate these parts in the cylinder head.
In addition, the camshaft drive chains are lubricated, and in a 6-cylinder gasoline engine, the oil pump drive chain is also lubricated.
Oil consumption
In the case of an internal combustion engine, oil consumption refers to the amount of oil that is consumed as a result of the combustion process. Under no circumstances should oil consumption be equated with oil loss, which occurs due to leaks in the oil pan, cylinder head cover, etc.
Normal oil consumption is due to combustion in a smaller amount, depending on the circumstances, in the cylinder, as well as due to the removal of combustion products and wear particles. In addition, the oil ages under the influence of high temperatures and pressures, which it is constantly subjected to in the engine. In addition, external operating conditions, such as driving conditions, as well as manufacturing tolerances, also affect oil consumption. The highest oil consumption should be no more than 1.5 l / 1000 km.
Attention: In no case should the oil level in the sump exceed the Maximal mark on the level indicator. If too much oil was washed down, then the excess must be drained. Otherwise, the catalytic converter may be damaged, as unburned oil enters the exhaust system.