What is the difference between National VI and National V?
2 Answers
The differences between National VI and National V: 1. Different sulfur content: The upper limit of sulfur content in National VI standard gasoline is 50mg per kilogram; the upper limit of sulfur content in National V standard gasoline is 10mg per kilogram. 2. Different implementation times: The implementation time of the National VI standard is December 2014; the implementation time of the National V standard is December 2017. Automobile emissions refer to harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot discharged from exhaust gases, all of which are harmful gases produced during the engine's combustion process. OBD, translated into Chinese as the On-Board Diagnostics system, monitors the vehicle's exhaust emissions in real-time during engine operation and issues an immediate warning if the emissions exceed the standard.
Recently, I've been researching emission standards and find the differences between China VI and China V quite worth discussing. Simply put, China VI is an upgraded version of China V, but far stricter. When China V was implemented around 2017, it was already more stringent than the previous China IV, mainly limiting nitrogen oxides and particulate emissions – for example, gasoline vehicles had a CO limit of about 0.1 grams per 100 kilometers. What about China VI? Rolled out in phases starting 2019, it's divided into China VI a and China VI b: Version a cuts limits by more than half, while b is even tougher, with CO limits as low as 0.03 grams and added restrictions on particulate count. The testing methods also became stricter – no longer just static lab tests but real-world dynamic monitoring while driving. I've noticed this genuinely helps the environment: China V vehicles might still emit some tailpipe pollution, but under China VI, new cars barely show visible exhaust smoke, significantly improving air quality in big cities and reducing long-term health risks from smog. However, China V vehicles remain road-legal, though China VI-compliant cars hold better resale value and compliance.
