What does 5w40 engine oil refer to?
1 Answers
Engine oil labeled as 5w40 indicates that it can be used in environmental temperatures ranging from -40 degrees Celsius to -10 degrees Celsius, with the '40' representing the oil's viscosity at 100 degrees Celsius. 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 into the oil filler port for two minutes, then tighten the oil drain plug after draining and wipe it with a tissue to check for leaks; 3. Reinstall the protective plate, lower the vehicle, and use a funnel to add new oil into the filler port. The functions of engine oil include: lubrication and anti-wear, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion prevention, and shock absorption. Engine oil can be categorized into: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Full synthetic oil.