How to Distinguish Between China 5 and China 6 Emission Standards for Vehicles?

[ORuby]

China 6 and China 5 mainly differ in the content of emissions. When purchasing a new car, you can check the vehicle's factory certificate and the environmental standard list to distinguish between them. Below is some information about China 6 and China 5: 1. The primary difference between China 6 and China 5 lies in the emission content, with China 6 standards being significantly lower than China 5 standards. 2. The carbon monoxide emission limit for gasoline vehicles under China 5 standards is 1000 mg/km, while under China 6 standards, it is 700 mg/km. 3. The emission limits of 'China 6 standards' are approximately 40% to 50% stricter than those of 'China 5 standards'.

[DeJuliana]

The simplest way to distinguish between China 5 and China 6 emission standards is to check the vehicle's production date and factory certificate. Based on my experience, China 6 vehicles are mostly produced after 2019, especially over 90% of new cars after 2020 meet China 6 standards. China 5 vehicles are mainly concentrated in the 2017-2019 batch. When helping friends check used cars, I teach them this trick: Open the front door and look at the nameplate below the B-pillar - if it says "GB18352.6-2016", it's China 6; if it shows "GB18352.5-2013", it's China 5. However, the most reliable method is to check the environmental protection information sheet that comes with the vehicle. This paper document is delivered with new cars and clearly states the emission standard in black and white. Some 4S salespeople might be evasive, so remember to directly enter the VIN on the Motor Vehicle Environmental Protection Website to verify and avoid being misled.

[DelLeah]

Last time I accompanied my neighbor to buy a car, I learned the tricks to distinguish between China 5 and China 6 emission standards. First, check the environmental information tag hanging on the car key—a small yellow card that clearly prints the emission standard, which many car owners overlook. Second, listen to the exhaust sound; there's a difference. China 6 vehicles are generally equipped with particulate filters, making the exhaust sound duller during cold starts. If that doesn't work, feel around: the three-way catalytic converter in the engine bay of a China 6 vehicle is noticeably larger than that of a China 5, with additional sensor wiring harnesses connected. Remember to check the third page of the vehicle conformity certificate—the emissions section clearly states whether it meets China 5 or China 6 standards, which is far more reliable than what the salesperson says.

[CadenMarie]

I'm a seasoned pro at reading spec sheets. China V and China VI standards are directly reflected in three areas: first, the number of oxygen sensors—China VI vehicles typically have at least four, while China V only has two; second, engine parameters—for the same model, the maximum torque RPM of the China VI version is usually tuned about 200 RPM lower; third, the fuel label inside the fuel tank cap—China VI vehicles will specify that only China VI standard gasoline must be used. Additionally, if you check the fault codes in the vehicle's computer and input emission system codes starting with P0, China VI vehicles have dozens more monitoring data points than China V. A handy trick is to scan the vehicle's QR code on the nameplate with a mobile app—many manufacturers embed emission information there.

[Cindy]

After seven years in this industry, the most intuitive identification method I've found is recognizing car emblems. For Volkswagen models, those with "280TSI" or "330TSI" badges on the rear are mostly China VI compliant, while "230TSI" is commonly seen on China V models. Among Japanese cars, Toyota vehicles with "D-4T" badges and Honda models marked with "Turbo" are generally China VI compliant. It's even simpler for domestic cars – China VI compliant new vehicles have a blue circular environmental label on the front windshield. Additionally, check the fuel filler neck: China VI compliant cars have special markings on the fuel cap stating "Please refuel with Phase VI compliant fuel." When inspecting a car yourself, bring an OBD scanner – the emission standard is clearly stated in the ECU data stream readings.

[VonKayden]

Back when I worked at the gas station, I saw this every day. There are even differences in fuel nozzle compatibility between China 5 and China 6 vehicles: China 6 vehicles experience much more frequent pump nozzle tripping during refueling due to more sensitive carbon canister design; when you open the oil cap, you'll notice China 6 engines mostly use 0W-20 low-viscosity oil, while China 5 typically uses 5W-30; looking under the chassis guard at the muffler, China 6 vehicles have noticeably larger bulges in the mid-section of the exhaust pipe to accommodate the particulate filter. The most reliable method is comparing environmental inspection reports - for diesel vehicles, check the smoke opacity value: China 6 requires ≤ 0.8m⁻¹ while China 5 allows up to 1.5m⁻¹. Veteran mechanics at roadside shops often check the 10th digit of the VIN - an 'L' indicates 2020 production, meaning China 6 standard.