What type of engine oil should be used for Audi's China 6b standard?

[SanSilas]

Audi's China 6b standard requires the use of 0W-20 engine oil. Definition of engine oil: Engine oil, motor oil, or engine lubricant is a substance enhanced with additives in a base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade viscosity index improvers. Engine oil is used for lubricating internal combustion engines. Functions of engine oil: The main functions of engine oil are to reduce friction and wear on moving parts and to remove sludge (one of the functions of dispersants) and varnish (from detergents) from the engine. Lubrication and friction reduction: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing shells. To prevent excessive wear on components, an oil film must be established between the two sliding surfaces. A sufficiently thick oil film separates the surfaces of the relatively sliding parts, thereby reducing wear.