What is the Difference Between China V and China VI Engines?

[OValeria]

The differences between China V and China VI emission standards are as follows: Different Emission Standards: China VI emission standards are more than 30% stricter than China V. 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 V standard was implemented nationwide on January 1, 2017. The China VI standard has been in effect since July 1, 2019. Different Principles: Under China V, diesel and gasoline vehicles had different emission standards, but China VI adopts a fuel-neutral principle, meaning the emission limits are the same regardless of the fuel type. Different Issuing Authorities: The China V standard was issued by the Ministry of Environmental Protection. The China VI standard was issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection, and Quarantine. Different Letter Representations: China V is represented by 'V,' while China VI is represented by 'VI.' Different Monitoring Requirements for Plug-in Hybrid Electric Vehicles (PHEVs): Compared to China V, China VI has enhanced monitoring requirements for PHEVs, including energy storage systems, thermal management systems, brake regeneration, drive motors, generators, and other regulatory aspects. China V Emission Limits: Gasoline vehicles must not emit more than 1,000 milligrams of carbon monoxide per kilometer driven. Non-methane hydrocarbons must not exceed 68 milligrams per kilometer. Nitrogen oxides must not exceed 60 milligrams per kilometer. PM (particulate matter) must not exceed 4.5 milligrams per kilometer. China VI has two standards: China VIa and China VIb, as follows: China VIa Emission Limits: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven. Non-methane hydrocarbons must not exceed 68 milligrams per kilometer. Nitrogen oxides must not exceed 60 milligrams per kilometer. PM must not exceed 4.5 milligrams per kilometer. China VIb Emission Limits: Gasoline vehicles must not emit more than 500 milligrams of carbon monoxide per kilometer driven. Non-methane hydrocarbons must not exceed 35 milligrams per kilometer. Nitrogen oxides must not exceed 35 milligrams per kilometer. PM must not exceed 3 milligrams per kilometer. Affected by China VI emission policies, although China V vehicles can still be used normally without restrictions like traffic bans or plate limitations, their resale value is significantly impacted. For truck owners, if they purchase a truck on loan for cargo 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 VI vehicles, with longer usability and more road rights, offer greater advantages.

[ArcherFitz]

I often discuss emission standards with my friends, and China 6 is a big improvement over China 5. China 5 had relatively loose requirements, with emission limits like nitrogen oxide control at less than 60mg/km, but China 6 suddenly dropped it to 35mg and also mandated the installation of GPF (Gasoline Particulate Filters), effectively filtering out those tiny black particles. There's much less pollution now, with PM2.5 emissions cut in half, making the air feel fresher when driving. I think this helps a lot with urban smog control, and in the long run, the investment in environmental protection is worth it. Some cars sound smoother when running on China 6 standards, and although they might be a bit more expensive, overall, it supports a low-carbon lifestyle. We car owners should embrace this change. When choosing a car, I prioritize China 6 standards—it's my small contribution.