What is the applicable scope of engine oil grade 0w40?
2 Answers
Engine oil grade 0w40 is suitable for cars with high oil viscosity and large displacement. The following is an introduction to the applicable scope of engine oil grade 0w40: Introduction: The W in 0w40 stands for Winter, and the smaller the number before it, the better the low-temperature fluidity of the engine oil, indicating a lower usable ambient temperature and better protection for the engine during cold starts. The number 40 indicates that the kinematic viscosity standard at 100 degrees Celsius is between 12.5m㎡/s and 16.3m㎡/s. Meaning: The number before W represents the flow performance at low temperatures. The smaller the number, the better the starting performance at low temperatures. The number after W represents the stability of the oil at high temperatures (i.e., the likelihood of thinning). The larger the number, the better the stability of the oil at high temperatures.
I think 0W40 oil is particularly suitable for places with significant weather changes. For example, I've been driving in the north for several years, where winters are extremely cold, with temperatures dropping to dozens of degrees below zero, making it hard to start the car. But with 0W40 oil, it starts easily because of its excellent low-temperature fluidity. During summer highway driving, when the engine temperature soars, the 40 high-temperature viscosity ensures stable protection for the engine, preventing damage to parts. It suits most cars, including my German car and my friend's Japanese SUV, with fewer issues even after long-term use, making it more worry-free than single-grade oils. Just make sure to choose genuine products—don't skimp on this expense. With good oil, you can drive worry-free for months after each change. I always advise car owners to follow the manual for regular oil changes and avoid using other grades randomly.
