How often should motor vehicle engine oil be changed?

[FranciscoDella]

Motor vehicle engine oil should be changed every 6 months. The method for changing engine oil is as follows: 1. Lift the vehicle, remove the protective plate, 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 for two minutes at the oil filler port, then tighten the oil drain plug after draining and wipe it with a tissue to check for oil leaks; 3. Reinstall the protective plate and lower the vehicle, then use a funnel to add oil at the oil filler port. The functions of engine oil include: lubrication, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion prevention, shock absorption, and anti-wear. Engine oil types are categorized into mineral oil, semi-synthetic oil, and full synthetic oil.