What is the difference between China 5 and China 6?

[OJosiah]

The differences between China 5 and China 6 emission standards are as follows: Different emission standards: China 6 emission standards are more than 30% stricter than China 5. Excluding the influence of driving conditions and testing, gasoline vehicles' carbon monoxide emissions are reduced by 50%, total hydrocarbons and non-methane hydrocarbons emissions are reduced by 50%, and nitrogen oxide emissions are reduced by 42%. Different implementation times: The China 5 standard was implemented nationwide on January 1, 2017, as the fifth stage of national motor vehicle emission standards. China 6 was implemented starting from July 1, 2019. Different principles: During the China 5 stage, diesel and gasoline vehicles had different emission standards, but China 6 adopts a fuel-neutral principle, meaning that regardless of the fuel type, the emission limits are the same. Different issuing departments: The China 5 standard was issued by the Ministry of Environmental Protection, while the China 6 standard was issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection, and Quarantine. Different letter representations: China 5 is represented by 'V,' and China 6 is represented by 'VI.' Different monitoring requirements for plug-in hybrid electric vehicles: Compared to China 5, China 6 has improved monitoring requirements for plug-in hybrid electric vehicles, including energy storage systems, thermal management systems, brake regeneration, drive motors, generators, and other regulations. China 5 standard limits are as follows: Gasoline vehicles must not emit more than 1,000 mg of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 mg of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 mg of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 mg of PM fine particles per kilometer driven. China 6 has two standards: China 6a and China 6b. They are as follows: China 6a standard limits: Gasoline vehicles must not emit more than 700 mg of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 mg of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 mg of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 mg of PM fine particles per kilometer driven. China 6b standard limits: Gasoline vehicles must not emit more than 500 mg of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 35 mg of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 35 mg of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 3 mg of PM fine particles per kilometer driven. Affected by the China 6 emission policy, although China 5 vehicles are not currently restricted from normal use, such as road restrictions or license plate limitations, their resale value will be significantly impacted. For truck owners, if they purchase a truck on loan for freight transport, the depreciation of the vehicle after paying off the loan is equivalent to the net profit earned during that period. A higher residual value means more profit for the owner. Therefore, from this perspective, China 6 vehicles, which have a longer service life and more road rights, offer greater advantages.

[StNora]

I found that the main differences between China 5 and China 6 lie in the emission standards. China 6 is much stricter than China 5, with lower limits for nitrogen oxides and particulate matter, ensuring cleaner exhaust. It also introduces real-world driving tests, requiring vehicles to meet standards during actual driving, unlike China 5 which only tested in lab conditions. This pushes automakers to improve technologies, such as adding gasoline particulate filters or optimizing engines. While China 6 vehicles may cost more upfront, they offer better fuel efficiency and long-term savings. In the used car market, China 5 vehicles depreciate faster, and major cities' traffic restrictions also affect their usability. From an environmental perspective, China 6 helps reduce smog and improve public health. I believe choosing a China 6-compliant new car is the trend, as it offers better adaptability.

[DiAugust]

As someone who has driven vehicles of different emission standards, there's a noticeable difference between China 5 and China 6. The China 6 emission controls are more refined, with less exhaust odor at startup and fresher air. Technologically, China 6 testing methods have been upgraded to include dynamic road tests ensuring stability. During the China 5 era, vehicles could easily meet requirements, but China 6 demands more advanced systems. The car price is slightly higher, but maintenance costs may decrease, and you save on fuel. The resale value of China 5 vehicles drops quickly, especially affected by driving restrictions. I recommend prioritizing China 6—it holds its value better, is more environmentally friendly, and gives peace of mind while driving. With future policy upgrades continuing, China 6 serves as a cornerstone.

[Myra]

I think China 6 has made significant progress. It imposes stricter emission limits, for example, halving nitrogen oxides, and includes real-driving tests to prevent cheating. The China 5 standard was relatively lenient, resulting in higher vehicle pollution. This technological advancement promotes cleaner engines and benefits air quality improvement. For used cars, China 5 models depreciate faster and face more driving restrictions, which is unfavorable. Choosing China 6-compliant vehicles is more beneficial in the long run.

[Brayden]

From the perspective of purchasing a new car, the cost difference between China 6 and China 5 standards is significant. China 6 vehicles, equipped with advanced emission control devices like sensors or filters, have a higher initial price but offer improved fuel efficiency for cost savings. Policy-wise, China 5 vehicles face greater depreciation risks in the used car market and restricted access in major cities. Maintenance is slightly easier for China 6 vehicles, with smoother inspection processes. They also provide superior environmental benefits, reducing health risks. Overall, investing in China 6 vehicles is a smarter choice.

[Ortega]

China VI represents a significant evolution over China V. The emission limits are stricter, focusing on controlling harmful exhaust substances, and the testing methods include real-world driving scenarios to ensure reliability. Technological advancements are substantial, such as the addition of particulate filters, promoting the development of green vehicles. During the China V era, vehicle pollution was higher, and the used car market faced restrictions. Although China VI vehicles are slightly more expensive, they offer better fuel efficiency. Choosing China VI represents embracing modern environmental trends, which I support.