If there is oil in the air filter element, it may be caused by the overturning of the motorcycle or too much oil. If there is only a small amount of engine oil in the air filter element, then the riders need not care. If the air cleaner element has a large amount of oil, repair is required.

Oil is called engine blood. If the engine does not have oil, the engine will not operate properly.
When the engine is running, the engine oil will form a layer of oil film on the surface of each component in the engine, which can prevent friction caused by direct contact of each component in the engine.
If the internal parts of the engine are directly contacted to generate friction when it is running, a large amount of heat will be generated in the engine instantly, which is fatal to the engine.
The performance of the engine oil will decline after a long time of use, so the engine oil needs to be replaced regularly.

It is recommended that you change the oil regularly during the normal use of the car. If the oil is not changed for a long time, the engine wear will be aggravated. When changing the oil, the oil filter element needs to be replaced together.
The oil filter element is used to filter the oil. If there is no oil filter element, the oil will be very dirty after being used for a period of time, which will also affect the normal lubrication of the engine.
When using the motorcycle at ordinary times, you must maintain and replace the wearing parts on time, which can prolong the life of the engine and keep the motorcycle in good condition.