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What is the best time and mileage for vehicle maintenance? What should I pay attention to?

Car maintenance is divided into major maintenance and minor maintenance. At ordinary times, the maintenance we do every 5000 km or half a year mainly refers to minor maintenance, including changing engine oil and filter, checking whether vehicle headlights, tires and brake pads are normal; while major maintenance mainly refers to changing engine coolant, timing belt, spark plug, changing transmission lubricating oil, changing brake oil and brake pads, as well as changing vehicle tires.

minor maintenance
How often or how often does the engine oil and filter be maintained? 4S stores always say that minor car maintenance needs to be carried out every 5000 km or half a year, otherwise the vehicle will be prone to problems. However, in fact, the minor maintenance cycle is related to the type of engine oil used. The types of oil we use are mainly divided into two types: fully synthetic oil and semi synthetic oil; mineral oil is basically eliminated. At present, the commonly used maintenance procedures are: semi synthetic oil should be replaced every 7-9 months within 7500 km; fully synthetic oil is generally maintained once a year or 10000 km, especially for Sn grade fully synthetic oil, which is more than 12000 km.
Minor vehicle maintenance is also closely related to the driving habits and road conditions of the vehicle owners. The more intense the car owners drive, the more intense they step on the gas pedal, which will consume more engine oil. Therefore, the vehicle maintenance cycle will be shortened accordingly. If the owner drives frequently on the urban road, the vehicle speed is low, and they often walk, stop and stop. In this case, the vehicle maintenance cycle will be shortened accordingly. However, as long as we drive normally and have no special working conditions, the full synthetic oil should be maintained every 10000 km or once a year, and the semi synthetic oil should be maintained within 7000 km or 7-9 months, which are all within the safe range.

major maintenance
There are many kinds of automobile maintenance, and the maintenance cycle of each item is different. Here we will explain them one by one.
1. Engine coolant maintenance
The maintenance cycle of engine coolant is generally maintained every 2-3 years or 40000 km. If the coolant is not replaced for a long time, it is easy to aging and deterioration. The deposits in the coolant increase, the fluidity becomes poor, and the engine cooling capacity deteriorates. When driving in summer, it is easy to cause the phenomenon of "boiling".
2. Engine timing belt replacement
Timing belt is an important part of engine valve system. The principle is to ensure the accuracy of intake and exhaust time by connecting with crankshaft and matching with certain transmission ratio. The replacement cycle of the timing belt is not fixed. Most of them are replaced around 60000-100000 km. The owner can check the timing belt in time according to the condition of the vehicle. If the timing belt shows signs of cracking, the fuel consumption of the vehicle increases suddenly and the power is poor, it is necessary to consider replacing the timing belt at this time.
3. Engine spark plug replacement cycle
The main function of the engine spark plug is to introduce the high voltage of the ignition coil into the engine cylinder, and produce sparks between the spark plug electrodes to ignite the mixture, so as to make the engine work. Once the spark plug is damaged, the combustible mixer in the engine cylinder will not be ignited, and there will be misfire as we often say. Sometimes, the engine will vibrate irregularly. The replacement cycle of spark plug is not fixed. For general vehicles, the spark plug needs to be replaced after 60000 km.
4. Transmission fluid maintenance
Transmission is mainly divided into MT, at, CVT and DCT according to different types. MT transmission and DCT transmission don't have high requirements for oil, so they can basically be free of maintenance for life. At transmission is relatively mature, and transmission oil does not need to be maintained deliberately. If the vehicle owner is not at ease, he can choose to maintain it every 100000 km. CVT transmission has different requirements for oil Yes, it's better for car owners to have a regular maintenance, but the maintenance cycle is quite long, and it's not too late to have another service over 80000 km.
5. The maintenance of brake oil and brake pad is based on the water content of brake oil. In general, when the water content of brake oil reaches more than 4%, the owner needs to replace it in time. Otherwise, due to the high temperature of brake oil and over 100 ℃, the water in brake oil will evaporate into water vapor, and the brake system will have poor braking force Foot fault.
Brake pad maintenance is based on the thickness of the brake pad or whether there is eccentric wear. Generally, the thickness of new brake pads is about 15mm, but when the thickness of our brake pads is less than 5mm, car owners need to consider replacing them. If our brake pads show signs of eccentric wear, as owners, they also need to be replaced in time.
6. Tire maintenance tire as the only contact between the car and the ground parts, it has a great impact on the safety of the vehicle, car owners must pay attention to it. There are two basis for tire maintenance, one is the time of 3-5 years, the other is about 50000-60000 km.
All tires are made of rubber. The rubber will age after long-term use, resulting in significant reduction of tire strength. Therefore, we should replace the tire in time after 3-5 years.
The longer the vehicle mileage is, the more serious the tire wear will be. If the tire wear reaches the bottom dead center, the thickness of the tire will become thinner, and the strength will decrease, and the owner will naturally need to replace it in time.