What are the maintenance items for a car that has run 20,000 kilometers?

[McRylee]

When a car has run 20,000 kilometers, the maintenance items include: changing the engine oil and oil filter, replacing the air filter, and some routine inspections. If the car uses ordinary material spark plugs, they also need to be replaced at 20,000 kilometers. The 20,000-kilometer service is considered an intermediate maintenance, while a major maintenance is performed every 40,000 kilometers. Vehicle maintenance refers to the preventive work of regularly inspecting, cleaning, replenishing, lubricating, adjusting, or replacing certain parts of the vehicle. The purpose of maintenance is to keep the vehicle clean, maintain normal technical conditions, eliminate hidden dangers, prevent failures, slow down the deterioration process, and extend the service life of various components.