What does 0w20 engine oil mean?
2 Answers
Engine oil 0w20 is a viscosity index of engine oil, where 'w' stands for winter, the number '0' before 'w' represents the freezing point temperature, and the number '20' after 'w' represents the kinematic viscosity of the oil at 100 degrees Celsius. The functions of engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the pressure rise at the engine cylinder port; 5. To flush away dirt generated on the working surfaces of parts. The method to check engine oil is: 1. Park the vehicle on a level road; 2. Pull out the oil dipstick after parking for 10 minutes; 3. Hold the oil dipstick perpendicular to the ground to check.
The 0W20 on engine oil represents a viscosity grade, simply indicating the oil's flow performance at different temperatures. The 0W in front means the oil flows very well in cold weather or during winter starts—the lower the number, the easier the start. For example, when I drive in northern winters, cold starts are effortless. The 20 at the back indicates that the oil maintains a thin viscosity during high-temperature driving, reducing internal engine friction, saving fuel, and protecting parts. I've been using 0W20 oil for years and feel my car accelerates smoothly, with lower fuel consumption than before—it's especially suitable for modern or hybrid cars. Remember, not all cars are suited for it; older or high-displacement vehicles might need thicker oil. Always check the manual or consult a mechanic before choosing.