Regular items for the third car maintenance include changing the engine oil, oil filter, air filter, cabin air filter, spark plugs, etc. Some brand manufacturers may add additional maintenance items. The reason for this variation depends on the service life of car components. Some parts have a shorter lifespan and are prone to contamination, requiring frequent replacement, while others have a longer lifespan and longer replacement intervals. Specific details are as follows: 1. Under the harsh conditions of high temperature and high pressure inside the engine, the shelf life of engine oil is significantly shortened, its performance greatly declines, and it loses its protective effect on the engine. The replacement interval for mineral oil is approximately 5,000 kilometers, while for synthetic oil, it is about 10,000 kilometers. 2. To ensure the cleanliness of the oil circuit, the engine is equipped with an oil filter in the lubrication system to prevent impurities from mixing with the oil, causing oxidation and producing sludge that can clog the oil passages. The oil filter should be replaced at the same interval as the engine oil and must be changed simultaneously with the oil. 3. The air filter serves to block dust and particles inhaled by 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. It is recommended to clean the air filter every 5,000 kilometers using an air gun to blow out the dust, and replace it every 10,000 kilometers. 4. Although gasoline quality is gradually improving, it may still contain some impurities and water. Therefore, gasoline must be filtered before entering the fuel pump to ensure smooth fuel flow. Since the fuel filter is disposable, it should be replaced every 10,000 kilometers.
