What are the effects of not changing engine oil on a vehicle?

[OKarter]

The effects of not changing engine oil on a vehicle are: 1. It can cause the engine to become louder; 2. It can lead to increased wear and tear on internal components, reducing the engine's lifespan. The functions of engine oil include: lubrication and anti-wear, aiding in cooling, cleaning, sealing and leak prevention, rust and corrosion protection, and shock absorption. Engine oil can be classified into: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Fully synthetic oil. The method for changing engine oil is: 1. Lift the vehicle, remove the undercover, and place a container of about 10 liters under 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 tighten the drain plug and wipe it with a tissue to check for leaks; 3. Reinstall the undercover and lower the vehicle, then use a funnel to add new oil through the filler port.