What are the steps for a DIY oil change?

[JasmineAnn]

The steps for a DIY oil change are: 1. Lift the car, remove the undercarriage protection panel, and place a container beneath the oil drain plug; 2. Unscrew the oil drain plug, use an air gun to blow into the oil filler port for two minutes, then after draining, tighten the oil drain plug and wipe it with a tissue to check for leaks; 3. Reinstall the undercarriage protection panel, lower the car, and add new oil through the filler port. The functions of engine oil are: 1. To reduce wear between the piston and cylinder, and between the crankshaft and bearings, providing lubrication; 2. To assist in cooling the engine internally; 3. To clean carbon deposits, sludge, and metal wear particles from engine components; 4. To minimize gas leakage and prevent external contaminants from entering; 5. To cushion and absorb shocks from the piston, piston rings, connecting rods, and crankshaft bearings.