What are the differences between National IV and National V emission standards?

1 Answers
MacHolden
07/30/25 2:57am
The differences between National IV and National V emission standards are: 1. Different release dates: National IV was released on December 30, 2005; National V was released on September 17, 2013. 2. Different stringency levels: Compared with National IV, the National V standard reduces nitrogen oxide (NOx) emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Vehicle emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC (hydrocarbons), NOx (nitrogen oxides), and PM (particulate matter).
Was this review help?
13
4
Share
More Forum Discussions

Should I Stay and Watch During the First Maintenance?

Yes, here are the reasons and items involved in the first maintenance: 1. While observing, you can also take a look at the workshop environment, assess the skills of the maintenance workers, and see if their operations are standardized and professional. You can even follow the entire process to clearly observe some operational steps, such as changing the engine oil and oil filter. During this time, you can discuss daily maintenance tips or driving methods with the workers, which can be very practical for handling unexpected situations in the future. 2. The first maintenance requires changing the engine oil. Engine oil plays roles in lubrication, cleaning, sealing, cooling, and reducing friction in the engine. Changing the oil helps reduce engine wear. 3. Replace the oil filter. Since the oil may contain various impurities during operation, the oil filter must be used to filter them before the oil flows into the engine, preventing blockages and other issues. 4. Clean the air filter. When a large amount of air enters the engine, it carries dust. If this unfiltered air directly enters the engine, it can cause cylinder wear and even severe issues like cylinder scoring.
6
5
Share

What are the differences between the Jaguar XEL and XFL?

XEL is positioned as a mid-size car, while XFL is a more high-end mid-to-large-size car. The specific differences are as follows: 1. Body size: The two cars have obvious differences in exterior dimensions. The Jaguar XFL clearly has an advantage in size due to its mid-to-large-size car positioning, while the Jaguar XEL, as a mid-size car, naturally has a clear disadvantage. 2. Other configurations: The Jaguar XFL features a panoramic sunroof, while the Jaguar XEL has a dual sunroof. The Jaguar XFL is equipped with optional features such as power-closing doors, an electric trunk, and a keyless entry system. The Jaguar XEL offers optional features like an electric trunk and a hands-free trunk function. 3. Seat configurations: Both models come standard with seat height adjustment, power adjustment for the driver and front passenger seats, rear seat adjustment buttons for the front passenger seat, and front seat heating. The Jaguar XFL also includes a power seat memory function, while it is an optional feature for the Jaguar XEL.
18
0
Share

How to Replace the Fender Turn Signal?

First, use pliers to bend a piece of iron wire into a hook shape for easier assembly later. Use a flat-head screwdriver to gently pry the turn signal from the edge, taking care to do it slowly. Remove the turn signal by hand, then unplug the wire connector. At this point, the removal is complete. When installing, use the crafted iron wire hook to pull it out from inside the fender. Gently press the turn signal into the fender's slot by hand. The installation is now complete.
13
5
Share

Where is the Cabin Air Filter Located in the Mazda 3 Xingcheng?

The cabin air filter in the Mazda 3 Xingcheng is located inside the center console near the left leg of the front passenger seat. It is recommended to clean the filter every 5,000 kilometers and replace it every 8,000 kilometers. When replacing, it is advisable to use genuine parts to ensure quality. The replacement steps are as follows: 1. First, release the two plastic clips under the glove compartment of the front passenger seat and remove the lower panel. 2. Insert your fingers into the gap of the plastic panel near the left leg of the front passenger seat and gently pull the panel outward. 3. Release the two plastic clips inside and slide the plastic panel toward the rear of the vehicle to remove it. 4. After removing the plastic panel, you will see the cabin air filter housing. Unscrew the screws on the housing to open it and access the filter. 5. Replace the old filter with a new one and reassemble the panels in the reverse order of disassembly. The Mazda 3 Xingcheng is a model of the Mazda 3 series launched by Changan Mazda in October 2011, and its Chinese name was officially confirmed as Mazda3 Xingcheng on June 23.
4
0
Share

How to Transfer Ownership of a Used Car Without a Temporary Residence Permit?

Without a temporary residence permit, you can transfer the ownership of a used car using the following methods: 1. If you don't have a temporary residence permit, you can use a business license for the transfer. 2. If you don't have a temporary residence permit, you can apply for a floating population information form at the local police station, which can usually be issued within about 3 working days. Take this form to the vehicle management office to complete the transfer procedures. Process of obtaining a residence permit (taking Guangdong as an example): 1. Your resident ID card. A photo receipt and photo for the residence permit, or the staff can read the photo information from the ID card chip. Residence registration receipt (if you have already registered at a hotel). 2. Submit one of the following proof materials: residence address, employment, or study. The proof materials must accurately state the applicant's name, ID number, residence address in Guangdong, and the situation of residing (or working, studying) in Guangdong for more than half a year. 3. For first-time applicants, the document fee is waived. For those who need to replace or reissue a residence permit due to loss or damage, a document fee of 20 yuan is charged. For eligible applicants who provide authentic and valid proof materials, a 'Guangdong Residence Permit Receipt Voucher' will be issued.
17
3
Share

Do 1K Paints Require Hardener?

1K paints do not require hardener. Here is additional information: 1. Hardener: Paint hardener is a specialized material used in paints to accelerate drying and enhance the drying speed. 2. Function: Paint curing occurs in two ways: one is physical drying, where the paint molecules react directly with oxygen in the air to achieve drying. The other is chemical curing, which involves combining components A and B to trigger a molecular reaction for drying. Component B is the hardener. This not only shortens the drying time but also makes the paint more durable.
8
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.