What is the Difference Between 10W30 and 10W40?
1 Answers
The differences between 10W30 and 10W40: 10W30 and 10W40 share the same low-temperature fluidity, maintaining normal viscosity at temperatures above -25°C, ensuring the vehicle operates normally. The engine can function properly. However, their high-temperature viscosities differ. 10W30 has lower high-temperature viscosity, better fluidity, and can reduce fuel consumption. The engine dissipates heat faster, but after application, the engine noise tends to be slightly louder. 10W40 has higher high-temperature viscosity, is thicker, and after application, the engine can handle higher loads with less noise, smoother operation, and greater stability. However, its fluidity is poorer, creating higher resistance for internal engine components and consuming more fuel. Comparison of 10W30 and 10W40 performance: Relatively speaking, the lower viscosity and better fluidity of 10W30 provide stronger power compared to 10W40, which has some disadvantages. Although 10W30 is more fuel-efficient and offers stronger power, its high-temperature shear resistance is weaker, and the oil film is prone to breaking, leading to higher wear than the higher-viscosity 10W40. Although 10W40 has poorer fluidity, higher resistance, and consumes more fuel, its performance is more stable, ensuring the engine operates normally under high-temperature conditions. Japanese naturally aspirated engines are more suitable for low-viscosity 10W30 oil, while German turbocharged engines are better suited for high-viscosity 10W40 oil. Choosing engine oil should not only consider power but also require comprehensive evaluation to select the most suitable oil for your engine.
