What else must the 30,000 km Buick Lang Wei Maintenance Manual do besides oil and machine filter?

Generally speaking, the 30,000-kilometer maintenance items of an automobile include oil change, oil filter, air filter, fuel filter, throttle cleaning and spark plug replacement. Some 4s shops will require other maintenance items, and the owners will consider them themselves and carry out maintenance according to the actual situation. It is necessary to change the engine oil and oil filter. Because the engine oil is in the harsh environment of high temperature and high pressure in the engine, the shelf life will be greatly shortened and the performance will be greatly reduced. Over time, it will not be used to protect the engine. In order to prevent impurities from mixing with engine oil and causing oxidation, the oil filter element produces colloid and sludge to block the oil circuit. Replace the oil and oil filter at the same time. The air filter should be replaced every 1- 1.5 thousand kilometers, and the fuel filter should be replaced every 30 thousand kilometers. The throttle valve needs to be cleaned for 30,000 km maintenance, but it was not needed before 30,000 km, so it can be rejected. The vehicle travels for at least 30,000 kilometers for a period of time. At this time, there will be more carbon deposits at the throttle, which will lead to a smaller throttle opening, and then there will be phenomena such as unstable idle speed and weak acceleration. If the owner feels that the power of the vehicle is declining during this period, then the throttle and spark plug should be considered during maintenance. It is time to change the spark plug after 30,000 kilometers, provided that it has not been changed before. The spark plug has not completely lost its function at 30 thousand kilometers, but the ignition performance of the spark plug has been greatly reduced, which directly affects the power, performance and fuel consumption of the engine. If you think the vehicle is running well, you can extend 10000 km.