The biggest difference between Volkswagen Tuyue Guowu and Guoliu is that the three-way catalyst is added to reduce exhaust emissions.
In fact, the biggest difference between China's fifth and sixth car models is the exhaust emission system, which is what we usually call the three-way catalytic converter. Upgrading the three-way catalytic converter can raise the vehicle's emission standard to that of China's sixth car, but the owners cannot upgrade themselves. These six car models must be produced by automobile manufacturers.
Affected by the national six emission standards, some models in the national five will have a certain degree of price reduction. Many car 4S stores will make some corresponding policies and make some substantial preferential policies to promote sales. The preferential range in the second-hand car market may be greater.
After the implementation of the Sixth National Standard, automobile exhaust emissions will be more than 50% less than those in the Fifth National Standard, carbon monoxide, hydrocarbon and non methane total hydrocarbon emissions will be reduced by 50%, and nitrogen oxide emissions will be reduced by 42%. In general, the Sixth National Standard for automobile emissions will be more stringent.
The emission standards of China's six cars are divided into the national six a standard and the national six b standard. The national six a standard was officially implemented on July 1, 2020, and the national six b standard was officially implemented on July 1, 2023. The national six car emission standard is the most stringent vehicle emission standard in China's history.