What are the differences between China V and China VI?

[McRichard]

The differences between China V and China VI emission standards are as follows: Different emission standards: The China VI emission standard is more than 30% stricter than China V. Excluding the influence of working 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, as the fifth stage of national motor vehicle emission standards. China VI has been implemented since July 1, 2019. Different principles: In the China V stage, diesel and gasoline vehicles had different emission standards, but China VI adopts a fuel-neutral principle, meaning that regardless of the fuel type, the emission limits are the same. Different issuing departments: The China V standard was issued by the Ministry of Environmental Protection, while 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: Compared to China V, China VI has improved monitoring requirements for plug-in hybrid electric vehicles, including energy storage systems, thermal management systems, brake regeneration, drive motors, generators, and other regulatory aspects. China V standard limits are as follows: Gasoline vehicles must not emit more than 1,000 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 milligrams of PM fine particles per kilometer driven. China VI has two standards: China VIa and China VIb, as follows: China VIa standard limits: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 4.5 milligrams of PM fine particles per kilometer driven. China VIb standard limits: Gasoline vehicles must not emit more than 500 milligrams of carbon monoxide per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of non-methane hydrocarbons per kilometer driven. Gasoline vehicles must not emit more than 35 milligrams of nitrogen oxides per kilometer driven. Gasoline vehicles must not emit more than 3 milligrams of PM fine particles per kilometer driven. Affected by the China VI emission policy, although China V vehicles can still be used normally without restrictions on driving or license plate numbers, their resale value will be significantly impacted. For car owners, if they purchase a truck on loan for cargo transport, the vehicle's depreciation after repaying 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 service life and more road rights, have greater advantages.

[DiVera]

I understand that the main difference between China 5 and China 6 is the stricter emission standards. China 6 is divided into two phases, a and b, with significantly more restrictions on pollutant emissions compared to China 5, such as harmful gases like carbon monoxide and nitrogen oxides. China 5 was implemented nationwide starting in 2017, while China 6 was gradually introduced from 2020 onwards. Now, all new vehicles must comply with China 6b. The most noticeable change is the improvement in urban air quality, with less smog, because China 6 requires vehicles to use more advanced exhaust treatment technologies. For example, gasoline vehicles are now equipped with Gasoline Particulate Filters (GPF) to trap soot particles. This represents a major step forward in environmental protection, reducing sources of PM2.5 pollution. Additionally, China 6 upgraded the On-Board Diagnostics (OBD) system to real-time monitoring, so any issues trigger a warning light much faster, prompting timely repairs. Having driven a China 5 vehicle before and now switching to a China 6 model, I’ve noticed that the exhaust smell is less noticeable, though fuel consumption has increased slightly by about 0.5 liters. Overall, choosing China 6 contributes to greener transportation and reduces environmental impact.

[VanClayton]

As a car enthusiast, I often study the technical differences between China 5 and China 6 emission standards. The China 6 standard introduced more complex systems, such as mandatory GPF (Gasoline Particulate Filter) to capture particles and reduce soot, while China 5 vehicles have relatively simpler exhaust treatment. China 6a is like a transitional phase, while the b phase is more stringent, with emission limits nearly 50% lower, and controls like hydrocarbon emissions are more precise. The diagnostic part has been upgraded with OBD (On-Board Diagnostics), enabling real-time tracking of emission status to prevent minor issues from escalating. These changes slightly increase vehicle maintenance costs but enhance reliability and durability. When repairing cars, I've noticed that China 6 engines have optimized combustion efficiency, with a greater impact on diesel vehicles requiring additional devices. When buying a car, if you seek a balance between performance, China 5 used cars are cheaper, while China 6 new cars focus on environmental protection. Overall, these technological upgrades drive industry innovation.

[VonMarcus]

When buying a new car, the difference between China 5 and China 6 emission standards affects the choice. China 6 vehicles are usually 10,000 to 20,000 RMB more expensive but have lower environmental taxes and better resale value. Major cities like Beijing and Shanghai favor China 6 vehicles in their traffic restriction policies, while China 5 vehicles may face quicker restrictions. The China 6 standard has been implemented for several years, and all new vehicle registrations now require it, gradually phasing out China 5. In daily use, China 6 vehicles have lower emissions and cleaner exhaust, but their maintenance parts are more expensive and require professional shops. When choosing a car, I prioritized future-proofing and opted for China 6b to avoid policy change hassles, considering it a more cost-effective choice.

[DeAiden]

From a policy perspective, the transition from China 5 to China 6 emission standards is key to advancing green transportation nationwide. China 5 was fully implemented in 2017, while China 6 has been rolled out in phases since 2020, with the more stringent China 6b standard perfected by 2023. Older vehicles are being phased out gradually, and the new standards impose stricter limits—for example, CO emissions have been reduced by over half. Urban air quality has improved noticeably, though the transition period presented challenges. I pay close attention to regulatory updates and always verify the compliance certification label when purchasing a vehicle to avoid buying non-compliant models. China 6b imposes higher requirements and employs more realistic testing methods to minimize cheating. In the long run, these policies drive automotive industry upgrades, with consumers benefiting from a cleaner environment.

[SanOlivia]

After years of driving experience, I can feel the practical differences between China 5 and China 6 standards. China 6 vehicles have cleaner emissions but slightly softer acceleration due to increased exhaust resistance from the GPF system. Fuel consumption increases by about 0.5L/100km, but there's less exhaust odor, making urban driving more reassuring. The China 6 OBD system is more sensitive, promptly identifying issues and improving reliability. However, it requires higher-quality fuel to avoid clogging problems. While China 5 vehicles are still usable, choosing a new China 6 model offers better durability and simpler daily maintenance.