What does 20w40 engine oil mean?

[OAlan]

20w40 engine oil means: 20 indicates the minimum applicable temperature of the oil is -15 degrees Celsius; w stands for winter; 40 represents the high-temperature viscosity of the oil, with a kinematic viscosity of 14.5cst at 100 degrees Celsius for the engine. The w in the grade stands for winter, and the number before it indicates the low-temperature fluidity of the oil. The smaller the number, the better the low-temperature fluidity. Engine oil, also known as motor lubricant, serves to lubricate and reduce wear, assist in cooling, seal and prevent leaks, protect against rust and corrosion, and cushion shocks in the engine. It is often referred to as the 'blood' of a car.

[VioletLee]

I remember the thing about 20W40 engine oil. It's the numerical label on the oil packaging, mainly telling us the viscosity grade. The W stands for Winter, and 20W means it flows well at low temperatures, such as a few degrees below zero, ensuring quick engine lubrication during startup without any stuttering. The 40 refers to the high-temperature part, indicating that it can maintain a protective layer even when the engine heats up during operation, preventing wear. This type of oil is particularly suitable for areas with significant weather changes, making it worry-free to use when there are large temperature differences between spring, autumn, winter, and summer. I used to rely on this type of oil for long-distance drives. Choosing the right oil can make the engine last longer and even save some money on fuel. Don’t switch brands randomly; always check the viscosity grade recommended in your car’s manual, or you might regret damaging your vehicle. During regular maintenance, remember to check if the oil is dirty, and timely replacement is key.

[Murphy]

Talking about 20W40 oil? It's actually the viscosity rating of the oil. The 'W' stands for Winter, and 20W means the engine can be quickly lubricated in cold weather, such as early mornings before turning on the air conditioning, preventing starting difficulties. The '40' indicates that the oil won't become too thin at high operating temperatures, providing a protective shield for the engine against overheating damage. This type of oil balances the needs of all seasons and is convenient for most family cars. I use it for driving from the city to the countryside without worrying about temperature differences. It's also important to change the oil regularly to extend engine life—don't skimp on the wrong oil to save money and cause problems. It also helps a bit with fuel efficiency, keeping things smooth and efficient.

[McMarley]

The 20W40 oil label indicates that the 'W' stands for good winter lubrication, '20' represents strong low-temperature fluidity for quick cold starts, and '40' ensures sufficient high-temperature protection to prevent engine overheating. Once, I was too lazy to change the oil in winter, and my car started slower. After switching to 20W40, it returned to normal. It's suitable for daily use in ordinary vehicles.

[OStephanie]

When it comes to 20W40 oil, it refers to the viscosity grade of the oil. The W stands for Winter performance, where 20W ensures the oil flows easily in cold weather, such as sub-zero conditions, to guarantee smooth starts. The 40 indicates the viscosity at high temperatures, maintaining safe engine operation. This is crucial for the vehicle's lifespan, as choosing the right oil prevents engine wear or excessive overheating. When using it, just check the oil level and ensure the color isn't too dark. It's best to change it every 5,000 kilometers or so—simple maintenance makes the car more durable.