What is the difference between Mobil Gold and Castrol Edge?

[AlexaMarie]

The difference between Mobil Gold and Castrol Edge lies in the composition of the lubricating oil: Mobil Gold's synthetic oil typically uses PAO as the base oil, while Castrol's synthetic oil generally employs ester-based synthetic oil. 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 is classified into: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Fully synthetic oil. The method for changing engine oil is as follows: 1. Lift the car, remove the underguard, and place a container of about 10 liters under the drain plug; 2. Unscrew the drain plug, use an air gun to blow into the oil filler port for two minutes, tighten the drain plug after draining, and wipe it with a tissue to check for leaks; 3. Reinstall the underguard and lower the car, then use a funnel to add oil into the filler port.