What does the oil grade 0w40 mean?

[RyderRose]

The oil grade 0w40 refers to the classification of the oil. The number before the 'w' represents the oil's viscosity at low temperatures, with a smaller number indicating better fluidity and cold resistance. The number after the 'w' represents the oil's viscosity index at high temperatures, with a higher number indicating greater viscosity. Oil, also known as engine lubricant, serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, dampen shocks, and resist wear. The steps for changing the oil are: 1. Lift the vehicle, remove the undercarriage protection panel, and place a container of about 10 liters under the oil drain plug; 2. Unscrew the oil drain plug and use an air gun to blow into the oil filler port for two minutes; 3. After draining, tighten the oil drain plug and wipe it with a tissue to check for leaks; 4. Reinstall the undercarriage protection panel, lower the vehicle, and use a funnel to add oil through the filler port.