Six details need attention when you want to change the oil yourself

If you want to change the oil yourself, you need to pay attention to 6 details, otherwise it will hurt the car

For the zero base Xiaobai, if you want to change the oil yourself, you need to meet four conditions first, and then talk about six precautions.

Condition 1: have time and strong practical ability; Condition 2: there is an environment where the engine oil can be changed, such as gutter; Condition 3: maintenance tools; Condition 4: ensure your own safety.

1. Selection of accessories; 2. Replacement of sealing ring and gasket; 3. Tightening torque; 4. Inspection of oil level; 5. Reset the maintenance lamp; 6. Waste disposal.

First, the choice of engine oil and filter. The engine oil, filter and other accessories on the market are mixed and uneven. When selecting the engine oil, we must pay attention to screening the low-quality engine oil, so as not to produce oil sludge after replacement, block the oil passage and cause too much loss to the engine. In addition, the purchased engine oil grade should conform to the engine design. For example, if the vehicle needs to be filled with 5W-40 engine oil, do not buy 5W-20 engine oil. The number in front of W represents the low-temperature fluidity of the engine oil. The smaller the number, the better the low-temperature fluidity; The number after w represents the viscosity of the oil. The larger the number, the more viscous the oil is. It should be noted that the larger (smaller) the number, the better, but in line with the engine design.

Second, replace the sealing ring and gasket. After solving the problem of accessories, the next step is to pay attention to the problems in the replacement process. The "O" seal ring on the old filter must be replaced. The seal ring is made of rubber. Working at high temperature for a long time will lead to hardening and fracture, so as to enter the engine and block the oil passage. Especially for the plastic shell filter with two or three sealing rings with smaller diameter, this type of sealing ring must be replaced. In addition, when removing the iron machine filter, observe whether the old sealing ring on the machine filter remains on the installation plane. If it remains on the installation plane, it must be removed, otherwise the new machine filter will cause oil leakage after installation. In addition, the aluminum gasket of the oil drain screw must also be replaced. It must be replaced as long as the gasket can be removed separately from the bolt. The aluminum gasket will deform after the first compression, and the plane contact gap will be large during the second compression, resulting in oil leakage.

Third, tightening torque. The most important thing is the tightening torque of machine filter and oil pan screws. Let's start with a common sense. The detachable oil drain screws of most (but not all) models on the market are tight in clockwise direction, loose in counterclockwise direction, and the same is true of machine filter. The tightening torque of the machine filter is ± 25N · M. if you don't know how much force you have exerted during operation, just remember one sentence: tighten the screw with the machine filter, but the tighter the better. In particular, the machine filter with plastic shell and the oil pan bolt with aluminum are easy to crack the machine filter shell and the oil pan if the torque is too large.

Fourth, check the oil level. After oil filling, start the vehicle to check whether there is oil leakage at the oil drain bolt and filter, and then turn off the engine to check the oil level. For vehicles with electronic liquid level, start the vehicle after oil filling and check it on the central control screen or instrument; For models with mechanical scale, you can directly observe the scale on the scale. Usually, the oil filling amount reaches the upper limit scale of the scale (the same as the electronic liquid level).

Fifth, zero and reset the maintenance lamp. The maintenance light is a warning light to prompt the vehicle for maintenance. It is usually lit on the driving instrument in the form of "wrench". Generally, it will be reset after changing the oil. It will be lit again when the oil needs to be changed next time. The maintenance and reset methods of each model are different, but most of them can be reset manually. You can find your own method.

Sixth, the treatment of machine filter and waste engine oil. The replaced waste engine oil and filter should be properly disposed of. Do not litter and pollute the environment.

The above six points are the problems needing attention when changing the engine oil, including the selection of accessories, the replacement of sealing rings and gaskets, tightening torque, the inspection of engine oil level, the reset of maintenance lamp and the disposal of waste.