Is 30,000 kilometers a major or minor maintenance?

[JosephLynn]

Thirty thousand kilometers is considered a major maintenance. Generally, the maintenance items for a car at 30,000 kilometers include changing the engine oil, oil filter, air filter, fuel filter, cleaning the throttle body, replacing the spark plugs, etc. Some 4S shops may recommend additional maintenance items, which car owners can consider and decide based on actual conditions. Below are the relevant details: 1. Changing the engine oil and oil filter: Replacing the engine oil and oil filter is a mandatory item. Due to the harsh high-temperature and high-pressure environment inside the engine, the shelf life of the engine oil is significantly shortened, and its performance greatly deteriorates. Over time, it will no longer protect the engine. The oil filter prevents impurities from mixing into the oil, which can cause oxidation and produce sludge that clogs the oil passages. The engine oil and oil filter should be replaced simultaneously. The air filter should be replaced every 10,000 to 15,000 kilometers, and the fuel filter should be replaced every 30,000 kilometers. 2. Cleaning the throttle body: Cleaning the throttle body is necessary at the 30,000-kilometer maintenance, but it is unnecessary before this mileage and can be declined. By 30,000 kilometers, the car has been driven for a considerable period, and the throttle body will have accumulated significant carbon deposits, leading to a reduced throttle opening and symptoms such as unstable idling and sluggish acceleration. If the car owner notices a drop in power during this period, they should consider inspecting the throttle body and spark plugs during maintenance. 3. Replacing the spark plugs: The spark plugs should also be replaced at 30,000 kilometers, provided they haven't been replaced before. At this mileage, the spark plugs haven't completely failed, but their ignition performance has significantly declined, directly affecting the engine's power, performance, and fuel consumption. If the car is running smoothly, the replacement can be delayed by another 10,000 kilometers. 4. Other items: Besides these items, the 30,000-kilometer maintenance also involves inspections and maintenance of dozens of items across multiple systems, including the engine, transmission, air conditioning system, steering system, braking system, suspension, body, and tires.