When maintaining engine oil, is it necessary to replace the oil filter?

Car engine oil maintenance is periodic. The oil must be changed when the mileage is reached or at a certain time point. So why is it necessary to change the oil filter at the same time as changing the oil?

First of all, what is the function of machine filtration?

The mechanical filter of a car is also known as the "oil filter". The function of the mechanical filter is to filter out impurities in the flowing oil in the lubrication system. After the engine has been running for some time, some impurities will be produced.

These impurities are mainly divided into two categories: One is the metal debris worn by engine parts during operation; Another type is the black mud-like organic matter (carbon deposits) produced during the operation of the engine when the engine oil undergoes chemical changes at high temperatures. . These impurities will mix into the engine oil and move along with the engine oil in the lubrication system.

So, must the oil filter be replaced at the same time as the oil maintenance?

Yes, it must be replaced. If the engine filter is not replaced, about 25% of the contaminants in the old engine filter will re-enter the oil circulation, which not only increases the chance of engine wear but also reduces the performance of the new oil. Therefore, when changing the engine oil, the filter must be replaced, which is also beneficial for extending the service life of the engine.

Since the filter needs to be replaced every time it is maintained, is it possible that the oil does not need to be changed?

No. Oil will lose its original performance after being used for a long time. When the oil is lubricated, it will play a certain cooling role. In fact, simply put, an oil filter can only filter out metal debris mixed in the engine oil and is of no use to the dust inside! Therefore, we need to replace the oil filter regularly and also change the engine oil according to the maintenance manual!