What maintenance is needed after a car has run 20,000 kilometers?

[MacChristian]

After a car has run 20,000 kilometers, the main maintenance items include the following: 1. Replace the engine oil and oil filter: Under the harsh conditions of high temperature and high pressure inside the engine, the shelf life of engine oil is significantly shortened, and its performance deteriorates substantially. Over time, it can no longer protect the engine effectively. The oil filter is replaced simultaneously to prevent impurities from mixing into the oil, which can cause oxidation, leading to the formation of sludge and clogging the oil passages. 2. The air filter's role is to block dust and particles from being sucked into the engine during the intake process. If the filter is not cleaned for a long time, dust can enter the engine, causing abnormal wear on the cylinder walls. If it was not replaced during the 10,000-kilometer maintenance, it should be replaced at the 20,000-kilometer maintenance.