Is 0W40 oil suitable for the new Sylphy?

[LilaDella]

The new Sylphy is not suitable for using 0W40 oil. However, occasional use won't cause major issues, though it may slightly increase fuel consumption. More details are as follows: 1. There are multiple reasons why most Japanese cars use lower viscosity oil, including their development philosophy (fuel efficiency) and the high machining precision of Japanese engines, which makes them less dependent on oil viscosity. 2. If the vehicle is older and shows signs of oil burning, 40 viscosity oil can be used. 0W-40 is the SAE grade of the oil, indicating its viscosity value. The smaller the number before W, the better the oil's low-temperature fluidity, meaning it can be used in lower environmental temperatures and provides better engine protection during cold starts. The number after W represents the oil's kinematic viscosity at 100°C - higher numbers indicate higher viscosity, better high-temperature protection performance, and better stability at high temperatures. Higher oil viscosity results in greater engine operating resistance and higher vehicle fuel consumption.