Should Wuling use 30 or 40 viscosity oil?

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Wuling vehicles can use 30 viscosity engine oil. Here is some extended information about engine oil: Increased fuel consumption: When adding engine oil, the oil level should be between the upper and lower limits on the dipstick. If too much oil is added, the engine temperature will rise, causing the oil volume to expand. This increases pressure in the oil chamber and operating resistance, leading to reduced vehicle power and increased fuel consumption. Overfilling oil: Excessive oil can cause oil to leak through the crankcase vent pipe. Increased crankcase pressure may loosen oil seals due to oil pressure, resulting in oil leaks. Heat dissipation: Overfilling oil can affect engine heat dissipation.