Is 5W30 or 5W40 engine oil better for BYD F3?
4 Answers
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.
I've been driving for over ten years and have driven many domestic cars, including the BYD F3. I've always used 5W30 oil, which feels quite suitable. It starts smoothly in cold weather, making winter driving effortless, and it also saves a bit on fuel consumption. My car averages just 7 liters per 100 kilometers in the city. 5W40 might make the engine quieter in high summer temperatures, but there's no real need to switch unless you frequently drive long distances or live in hot southern regions. Remember, the manual usually recommends 5W30, so sticking to that is the most reliable option—no need to waste money switching oil brands. The most important thing is to change the oil every 5,000 kilometers, just choose a reputable brand. If the engine noise gets louder over time, then consider switching to a higher viscosity oil—it's never too late.
As someone who frequently tinkers with cars, I believe oil selection should first consider the meaning of the viscosity grade: 5W indicates low-temperature fluidity, making cold starts easier; 30 or 40 represents high-temperature viscosity, with higher numbers indicating thicker oil. For compact car engines like the BYD F3, 5W30's lower viscosity reduces friction, improving fuel efficiency and throttle response—ideal for city driving. 5W40 suits high-temperature regions or frequent highway driving, offering better engine component protection. However, the F3's factory design typically specifies 5W30; frequently switching to higher viscosity may waste fuel and increase carbon buildup risks. Always check the manual for brand recommendations—timely oil changes matter more than obsessing over viscosity grades.
Living in the northeast, I found that my car has difficulty starting in cold weather, but using 5W30 oil has significantly reduced the problem. Cars like the BYD F3 generally have engines that aren't very cold-resistant, and 5W30's better fluidity makes it easier to start in winter. If driving in the south during summer or under continuous high temperatures, 5W40's higher viscosity can prevent the oil from thinning. However, the manual usually recommends 5W30 as the primary choice, with adjustments made according to climate changes. Avoid frequent oil changes and prioritize the manufacturer's recommendations.
