Is Higher or Lower Viscosity Engine Oil Better for Cars?

[DelBrielle]

The choice between higher or lower viscosity engine oil mainly depends on the following situations: 1. For oil viscosities 30 and 40, viscosity 40 means the oil has higher viscosity and better sealing performance, but the engine will consume more fuel. 2. At idle, higher viscosity oil results in lower noise, while during driving, higher viscosity oil leads to higher noise. Lower viscosity oil, on the other hand, has the characteristic of being more fuel-efficient. Additional information: The viscosity of engine oil should be selected based on the engine's own condition and the ambient temperature. If the gaps between internal engine components are small, lower viscosity oil is needed; conversely, larger gaps require higher viscosity oil.