What is the principle of car reminder oil change? How to change the car oil?

After a certain period of time, the instrument of our car will light up to prompt oil change. Some cars are icons of an oil pot, others are tips: Please change the oil quickly, and some cars will show the life of the oil. So how does the car know that we should carry out maintenance?

The principle of reminding cars to change oil is actually very simple. Our car is calculated by mileage. The oil warning light will be reset whenever we change the oil for maintenance. When our car travels to a certain number of kilometers, our car will re-light the maintenance light to remind us to change the oil. We can set the oil life by ourselves, so when our oil life is set to 100%, the oil life will gradually increase with our mileage and the oil will gradually decrease. When we reach a certain mileage, the engine oil life will become zero, and we will replace the engine oil. How to change the car oil?

Start the vehicle for about 1 min to make the oil flow fully, and then turn off the engine. Remove the underbody guard to expose the oil filter and oil drain screw, and unscrew the oil drain screw on the oil pan. Pay attention to the oil will be sprayed out instantly, and the temperature is high. Move the oil tank to the lower part of the vehicle to contain the old oil. Open the oil filler cap and loosen the filter and oil bottom screw with tools. Put the oil pan under the oil pan screw, completely loosen the oil pan screw, and drain the old oil until the oil completely stops flowing. Tighten the oil bottom screw and wipe off excess oil stains with cotton cloth. Unscrew the old filter. It is recommended to put on cotton cloth and be careful to burn your hands. Apply engine oil to the sealing ring of the new filter and tighten it clockwise. Add new oil from the oil filler. It is recommended to consult the 4S shop in advance about the amount to be added, and tighten the fuel filler cap after adding. Restart the engine 1-2 minutes, and observe whether there is oil leakage at the oil bottom screw and machine filter. If there is oil leakage, shut down the engine in time and check and deal with it. If there is no oil leakage, check the oil level of the dipstick after flameout, and add it to the standard position (and replace it.