- Oil filter
- Air filter
- Fuel filter
- Cabin filter (pollen filter)
The oil filter's job is to remove the contaminants from the oil. Dirt particles larger than 5µm (0,005mm) remain in the paper filter element. By filtering the oil, the engine will have a longer life, because dirt particles such as metal and carbon particles can damage the components in the engine. The oil filter must therefore be replaced periodically. This almost always happens together with the engine oil change. This usually happens between 15.000 and 30.000 km and 1 or 2 years.
There are various types of oil filters. The images below show two different oil filters.
screw-on filter: This is a widely used oil filter. This consists of a metal housing containing a paper filter element. During a service, the entire filter is replaced, including the metal housing.
If there are too many dirt particles in the paper filter element, the filter may become clogged. Causes can be; serious engine pollution due to driving too long with old engine oil or driving too long with an old oil filter. In order not to block the entire oil supply to the engine, the pressure relief valve will open against the spring force. At that moment, the oil no longer flows through the paper filter element, but immediately leaves the filter housing. At that moment the oil is not filtered and dirt particles will enter the engine Worden pumped around.
Interchangeable filter element: The exchangeable filter element is located in the motor under a screw cover. This lid can be made of metal or plastic and often has to be unscrewed with a special oil filter cap. During maintenance, only this paper filter element is replaced and not the entire metal filter housing with pressure relief valve, etc.
In the picture below, this type of oil filter is disassembled. The paper filter element can be clicked out of the plastic cap, then the new one can be clicked in. Never forget to replace the rubber ring of this cap and lubricate it lightly with oil before reassembling the filter. If the rubber ring is not lubricated, it may tear during assembly.
This type of oil filter is often mounted on the top of the engine. It is therefore important to loosen these first before draining the engine oil. A large amount of oil still falls to the crankcase when the filter is loosened. There is a valve in the oil filter housing that ensures that the oil filter does not empty when the engine is turned off. That would mean that every time it is started, there is no oil pressure for a few seconds. For this reason, the filter always remains filled. Always remove the oil filter first, preferably remove it, and only then drain the oil.