What type of engine oil is recommended for the Changan CS55?

[AllisonFitz]

The maintenance manual recommends 5W-30. Approximately 3.5 liters are needed for each oil change. In practice, 5W-40 oil can also be used. Relevant details are as follows: 1. Turbocharged engines have strict requirements for engine oil because turbochargers operate at high temperatures and high speeds. In such conditions, full synthetic oil must be used. 2. Both 5W-30 and 5W-40 are SAE standard viscosity grades for engine oil. The number before the W indicates the lowest temperature at which the oil can be used. The number after the W represents the oil's kinematic viscosity at 100°C. A higher number indicates higher viscosity, better protection at high temperatures, and better stability under high-temperature conditions.