What is the difference between 30 and 40 engine oil?
1 Answers
The differences between 30 and 40 engine oil are: 1. 30 engine oil has better fluidity than 40; 2. 30 engine oil has poorer oil stability at high temperatures compared to 40. The functions of engine oil include: lubrication and anti-wear, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion protection, and shock absorption. The method for changing engine oil is: 1. Lift the car, remove the protective plate, and place a container 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, tighten the oil drain plug after draining, and wipe and check for leaks with a paper towel; 3. Reinstall the protective plate, lower the car, and add oil at the filler port.