What Does Engine Oil Grade Mean?
2 Answers
The meaning of engine oil grade is: 1. 'W' stands for winter, indicating it can be used in winter; 2. The number before 'W' represents low-temperature fluidity—the smaller the number, the better the low-temperature fluidity, the lower the ambient temperature it can be used in, and the better the protection for the engine during cold starts; 3. The number after 'W' indicates the oil's high-temperature resistance—the larger the number, the better the oil's protective performance under high temperatures. The method for choosing the right engine oil grade is: 1. Consider the season and driving conditions; 2. The severity of the engine's working conditions, additional devices in the intake and exhaust systems, and the production year. Engine oil can reduce wear on engine parts and extend their service life.
Engine oil viscosity grades are like the ID numbers of motor oil, telling you its performance under different temperatures, which I find absolutely crucial. Take the example of 5W-30: the W stands for winter, where a lower number before it indicates better fluidity in cold weather, making engine startup easier; the number after represents high-temperature viscosity, protecting engine components. When I change oil myself, I always check the vehicle manual for recommended grades because using the wrong one may cause increased noise or accelerated wear. In cold winter regions, oils with lower W numbers prevent freezing; in summer, stable viscosity oils reduce sludge buildup. In short, matching the oil to your vehicle's condition and environment extends its lifespan. I recommend regularly checking your oil's condition—never overlook this detail.
