Is it necessary to replace all three filters when changing engine oil?

[StDonovan]

It is not mandatory to replace all three filters when changing engine oil. Below are the instructions for replacing the oil filter: 1. Relationship between the oil filter and engine oil: Generally, the oil filter is replaced simultaneously with the engine oil. If the oil filter is not replaced, dirt from the old filter may enter the engine, contaminating the newly replaced oil. Additionally, a heavily soiled oil filter will have reduced filtration efficiency, affecting oil pressure and potentially causing insufficient lubrication in the engine. 2. Replacement cycle for the fuel filter: The typical replacement interval for the fuel filter is 10,000-20,000 kilometers, and the same applies to the air filter. However, the actual replacement cycle should be determined based on specific conditions. For instance, the air filter cleans the air entering the engine by removing impurities. If these impurities enter the cylinders, they can cause abnormal wear and shorten the engine's lifespan. If the driving environment is harsh with poor air quality, the air filter should be replaced earlier.