What are the steps for changing car engine oil?

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The steps for changing car engine oil are: 1. Lift the car, remove the protective plate, and place a container under the oil drain plug; 2. Unscrew the oil drain plug, use an air gun to blow for two minutes at the oil filler port, after draining, tighten the oil drain plug and wipe it with a tissue to check for leaks; 3. Reinstall the protective plate and lower the car, then add oil through the filler port. The functions of engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the pressure rise in the engine cylinder port; 5. To flush away dirt generated on the working surfaces of parts.