Should the Great Wall C30 use 5W30 or 5W40?

[StLevi]

The Great Wall C30 series is equipped with a 1.5L naturally aspirated engine. For this vehicle, 5W30 engine oil is sufficient, as there's no need to use 40 viscosity oil for naturally aspirated engines. Here's more information about engine oil: 1. Engine oil is often referred to as the lifeblood of an engine. Without oil, the engine cannot operate. During operation, the oil forms a protective film on the surfaces of engine components, preventing direct contact and friction between parts. 2. If engine components directly contact and create friction, it can generate intense heat instantly, potentially causing severe engine damage. Beyond lubrication, engine oil also performs crucial functions including cleaning, sealing, cushioning, rust prevention, and heat dissipation within the engine.