In addition to changing the oil, what else should be maintained for car maintenance?

Car maintenance is not only as simple as changing oil and filter, but also requires a lot of maintenance, such as air filter and spark plug. The following are some common maintenance items. Oil and machine filter For car owners and friends, oil change and machine filter are the most common items, but the mileage of oil change is judged according to the type of oil. We know that there are mineral oil, semi-synthetic engine oil and all of synthetic engine oil. Here we suggest that if you are your own family car, you'd better choose semi-synthetic oil or more, especially for turbocharged cars, and you'd better use fully synthetic oil. It is generally recommended to replace mineral oil for 5000 km, synthetic engine oil for 7500 km and synthetic engine oil for 10000 km. If the road conditions are not good, it should be replaced 20% in advance. For example, in synthetic engine oil, it was originally 10000 km, and it will be replaced after 7500 km. Replacement of brake fluid Generally speaking, the replacement cycle of brake fluid is about 2 years or 40 thousand kilometers, but in fact, if the vehicle runs less, it can be replaced in about 3 years. If you don't know whether it should be replaced, you can use a special testing instrument to test the water content of brake fluid, as shown in the following figure. If the water content is greater than 3%, the brake fluid needs to be replaced. Cleaning of engine carbon deposit Finally, let's talk about cleaning of engine carbon deposit. Generally, if there is nothing abnormal in the engine, such as insufficient engine power and idling jitter, there is no need to clean up the carbon deposits. Common cleaning methods of engine carbon deposit include cleaning throttle, cleaning valve and intake manifold, cleaning fuel injector, etc. For these projects, it is recommended to clean them every 30,000-40,000 kilometers. For example, we can check the throttle opening with a diagnostic instrument. If the opening is greater than 3, we can clean the throttle. For other items, you can look at the long-term and short-term fuel injection corrections on the combustion data, as shown in the following figure. If these two data are less than 5%, there is no need to clean them up. To sum up, in addition to changing the oil, there are still many parts to be replaced in car maintenance. The owner's friend should maintain the vehicle according to the data in the maintenance manual, so that the vehicle can reach the best state.