Generally, the maintenance items for a car at 30,000 kilometers include changing the engine oil, oil filter, air filter, fuel filter, throttle cleaning, and replacing spark plugs. Some 4S shops may recommend additional maintenance items, which can be considered based on personal preference and actual conditions. Below are some extended details: 1. Engine Oil and Four Filters: The four filters in the engine oil system include the oil filter, air filter, fuel filter, and cabin air filter. The oil filter should be replaced at every maintenance interval, while the air filter is recommended to be replaced every 10,000–15,000 kilometers, the fuel filter every 30,000 kilometers, and the cabin air filter every six months. To save costs, you can skip replacing the cabin air filter. However, the fuel filter must be replaced during the major 30,000-kilometer maintenance. 2. Throttle Cleaning: Throttle cleaning is unnecessary before 30,000 kilometers. If a 4S shop or repair shop recommends this service at 10,000 or 20,000 kilometers, you can directly refuse. Over time, carbon deposits accumulate at the throttle valve due to prolonged air intake, leading to reduced airflow. This can cause minor idle instability, idle shaking, weak acceleration, and indirectly increase fuel consumption. 3. Spark Plugs: Spark plugs should be replaced at 30,000 kilometers. Although they may not have completely lost their ignition performance by this point, their efficiency is significantly reduced. Poor ignition performance directly affects idle shaking, engine misfires, and weak acceleration. It also increases engine load, contributing to higher fuel consumption. 4. Air Conditioning Cleaning: Air conditioning cleaning removes dust, dirt, and bacteria from the air conditioning system. This service is optional. If the car has never undergone air conditioning cleaning before 30,000 kilometers, it is advisable to do it now.
