Changing the oil filter when changing the oil

A reader asked, is it necessary to change the oil filter every time the oil is changed? How can the filter play a role in purifying the oil? For this purpose we consulted experts on the use of lubricants. Experts stressed that: changing oil must change the oil filter.

Every time you change the oil, you must replace the full-flow oil filter, which is the paper filter cartridge. After a long period of use, the paper filter will have a reduced filtration efficiency, and the oil pressure through the filter will be greatly reduced. Although the oil pressure is reduced to a certain degree, the filter bypass valve will open and the oil will pass through the bypass into the oil circuit to prevent the oil pressure from being insufficient, but at this time, the oil that enters the oil circuit will not be filtered and will cause pollutants to enter the oil circuit. In the increase of machine wear. Therefore, the filter plays a vital role in purifying the oil. Impurities and particles in the oil are filtered out through the filter. In this way, the oil entering the oil circuit is very clean, which can effectively prevent abrasive wear caused by particulate matter on engine parts.

If only the new oil is replaced without replacing the oil filter, about 1/4 of the contaminants in the old filter will re-enter the oil circulation, which not only increases the chance of wear, but also reduces the performance of the new oil.