What grade of engine oil should be used for Jetta VS5?

[Maggie]

Jetta VS5 uses engine oil with a grade of 5W-40 or 5W-30, with a quantity of 4.0 liters. Engine oil plays roles such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion prevention, and shock absorption for the engine. Below is an introduction to engine oil: Applicable types of engine oil: ab series: Gasoline and light-duty diesel engine oil; c series: Catalyst-compatible engine oil; e series: Heavy-duty diesel engine oil. Classification of engine oil: Automotive engine oil is specifically classified into 4 types for summer use, 6 types for winter use, and 16 types for all-season use. The summer oil grades are: 20, 30, 40, 50, where a larger number indicates higher viscosity and suitability for higher maximum temperatures. The winter oil grades are: 0W, 5W, 10W, 15W, 20W, 25W, where the symbol W stands for Winter, and a smaller number before W indicates lower low-temperature viscosity, better low-temperature fluidity, and suitability for lower minimum temperatures. The all-season oil grades are: 5W-20, 5W-30, 5W-40, 5W-50, 10W-20, 10W-30, 10W-40, 10W-50, 15W-20, 15W-30, 15W-40, 15W-50, 20W-20, 20W-30, 20W-40, 20W-50.