Should the old Excelle use 5w30 or 5w40?

[LeahMarie]

The old Excelle uses 5w30. The functions of engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the pressure rise at the engine cylinder port; 5. To flush away dirt generated on the working surfaces of parts. Taking the Excelle 2004 1.6L manual comfort version as an example, its length, width, and height are 4515 mm, 1725 mm, and 1445 mm respectively, with a wheelbase of 2600 mm, and the body structure is a 4-door 5-seater sedan. In terms of power, it is equipped with a 1.6L naturally aspirated engine, paired with a 5-speed manual transmission.