Oil Filters work by filtering dirt and debris from engine oil as it is being lubricated.
- All automotive engine lubricating systems consist of an oil filter. The oil from the pump flows through the filter before reaching the engine bearings. The filter has a pleated-paper filtering element. It enables to allow the oil to pass through while trapping particles of dirt and carbon.
- The filter has a spring-loaded bypass valve. It opens to protect the engine from oil starvation if the filter becomes clogged. The unfiltered oil bypasses the filter and goes directly to the engine. However, the filter should be changed before this happens.
- Some oil filters have an anti-drain back valve. It helps prevent oil from draining out of the filter while the engine is off. A full filter supplies oil quickly on starting. This reduces wear and possible damage