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Is 5W30 or 5W40 engine oil better for BYD F3?

1 Answers

Layla

07/30/25 2:57am

The main differences between 5W30 and 5W40 are: 1. 5W-30: It has relatively better fluidity, which helps in reducing fuel consumption more effectively, allowing the engine to dissipate heat faster and more efficiently. However, if an engine strictly requires 5W-40 but 5W-30 is used instead, it may result in higher than normal fuel consumption. 2. 5W-40: Under high-temperature conditions, 5W-40 offers better oil stability. Additional information: The main functions of engine oil include the following: 1. Lubrication and friction reduction: It forms an oil film on the surfaces of two sliding components, preventing friction during operation and ensuring smooth movement. 2. Auxiliary cooling: The engine generates high temperatures during operation. When the oil reaches the operating parts, it absorbs heat and carries it away, aiding in heat dissipation. 3. Cleaning: It can carry carbon deposits, sludge, and metal wear particles back to the oil tank through circulation, washing away contaminants from the working surfaces of the components. 4. Sealing and leakage prevention: The oil can form a seal between the piston rings and the piston, reducing gas leakage and preventing the entry of external contaminants. 5. Rust and corrosion prevention: The lubricant can protect the surfaces of components from water, air, acidic substances, and harmful gases. 6. Shock absorption: When the pressure in the engine cylinder rises sharply, the load on the piston, piston skirt, connecting rod, and crankshaft bearings increases suddenly. This load is transmitted and lubricated through the bearings, cushioning the impact load.

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