Oil filter of a car
An oil filter of an internal combustion engine is a filter to purge the lubricating oil from the dirt that the oil has collected during its operation.
The oil filter must be replaced regularly. The quality of oil filters is getting higher, among other things, the surface on which the filtering is done will always increase. Because the quality of lubricating oil is also improving, the interval for the replacement of the oil filter increases. For automotive vehicles, one year or 30,000 km runs.
Lubricating oil is pumped through the filter by a gear pump from the carter, moving from there to the different bearings in the engine after which the weather in the carter goes back. Some motors have mounted an oil cooler behind the filter. The oil filter is attached to the outside of the engine. This makes the filter easy to replace and the oil is also partially cooled.
An oil filter usually filters the entire oil flow (a full flow filter). In older engines, a bypass filter was sometimes used to split the oil stream behind the pump and only a portion of the oil flow ran through the filter, the rest went (unfiltered) to the bearings, see lubrication system.
If the oil is very dirty, or if the filter is not replaced for a long time, the pressure difference across the filter may become too high. In the filter there is an overpressure valve that opens when the pressure in the filter becomes too high, the oil is no longer filtered.
wiki
