What does 0w40 engine oil represent?
2 Answers
0w40 engine oil represents: the oil can still flow normally at minus 35 degrees Celsius, and 40 is the high-temperature viscosity of the oil. The functions of engine oil are: lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion prevention, and shock absorption. The method for changing engine oil is: 1. Lift the car, remove the guard plate, and place a container of about 10 liters under the oil drain screw; 2. Unscrew the oil drain screw and use an air gun to blow for two minutes at the oil filling port; 3. After draining, tighten the oil drain screw and wipe it with a paper towel to check for leaks; 4. Reinstall the guard plate and lower the car, then use a funnel to align with the oil filling port to add engine oil.
Hey, when it comes to engine oil like 0W40, it's all about the viscosity rating. As a seasoned driver with 20 years of experience, I've seen all kinds of engine oils. This 0W40 actually follows the SAE viscosity standard: 0W means the oil flows well in cold winter temperatures, ensuring smooth starts even below -40 degrees Celsius; while the 40 indicates its thickness at high temperatures—the higher the number, the better protection it provides during high-speed engine operation. Simply put, this type of oil is especially suitable for northern winters or drivers who frequently take long trips, as it ensures smooth cold starts and withstands high temperatures. I still remember using 5W30 in my car before—it wouldn't start at temperatures dozens of degrees below zero until I switched to 0W40. But don't just use it blindly—check your car's manual for recommendations. For example, German cars or high-performance engines are better suited for it; otherwise, you're just wasting money and potentially harming your engine. In short, choosing the right oil can extend your engine's lifespan, which is why I personally inspect it during every maintenance check.
