What are the differences between National 4 and National 5?

1 Answers
AndrewFitz
07/30/25 1:22am
The differences between National 4 and National 5 are as follows: 1. Different meanings: The National 4 emission standard is the fourth stage of China's motor vehicle pollutant emission standards, while the National 5 emission standard is the fifth stage, known as the 'National 5 standard'. Compared to National 4, National 5 is more stringent, resulting in fewer pollutants emitted, making it more environmentally friendly. 2. Different standards: Compared to National 4, the new National 5 standard reduces nitrogen oxide emissions by 25% for light-duty vehicles and by 43% for heavy-duty vehicles. 3. Different symbols: The symbol for National 4 is IV, while the symbol for National 5 is V.
Was this review help?
16
2
Share
More Forum Discussions

Should the clutch be fully released after starting?

After starting, the clutch needs to be fully released. Once the car starts smoothly, releasing the clutch completely has no impact. When the vehicle begins to move, it is important to keep the left foot steady on the clutch pedal without pressing down or lifting to avoid stalling. Hold it steady for 3 seconds, then slowly release the clutch while gently pressing the accelerator with the ball of the right foot. Here are some additional tips for starting: When starting the vehicle, ensure that the doors are closed and seat belts are fastened. Check the mirrors to confirm safety on both the left and right sides before moving. Activate the left turn signal before starting. Release the parking brake lever as you start. Control the accelerator pedal appropriately to prevent jerky movements. Use a low gear when starting.
19
1
Share

How many cylinders does the Mercedes-Benz C260L engine have?

The Mercedes-Benz C260L is equipped with a four-cylinder engine. Below are the relevant details about the Mercedes-Benz C260L: 1. Dimensions: The Mercedes-Benz C260L has a body size of 4784×1810×1457mm with a wheelbase of 2920mm. 2. Performance: The Mercedes-Benz C260L is powered by a 1.5L turbocharged engine with a maximum power output of 135kw, paired with a 9-speed AT transmission. It accelerates from 0 to 100 km/h in 8.5 seconds and has a fuel consumption of 6L per 100 km. 3. Exterior: The car features a well-proportioned and aesthetically pleasing body design. The side profile is accentuated by two bold waistlines that highlight its sporty character, complemented by chrome trim on the windows and door bottoms, enhancing the overall premium feel of the vehicle.
7
3
Share

What Causes Unstable Idle Speed at Startup?

The reasons for unstable idle speed after startup are: 1. Clogged idle air passage or malfunctioning idle control device; 2. Weak spark in individual cylinder spark plugs; 3. Poor sealing of individual valves or intake manifold leaks; 4. Incorrect ignition timing (too early or too late) or improper idle speed adjustment. Solutions: 1. When the engine idle is unstable, adjust the idle speed first. If the problem persists after adjustment, check whether the idle jet and idle air jet are clogged. If clogged, clean them with gasoline or acetone and blow through with compressed air; 2. If unstable idle is accompanied by reduced engine power, further inspect spark plug performance, valve sealing, and ignition timing. Repair or adjust as necessary.
18
2
Share

Why does the Mazda Atenza sway from side to side at low speeds?

The Mazda Atenza's swaying from side to side at low speeds is caused by incorrect wheel balance data. Below is a detailed introduction to the Mazda Atenza: 1. Configuration: The new vehicle comes standard with features such as an intelligent idle stop system and brake energy recovery system. The Mazda Atenza 2.5L model accelerates from 0 to 100 km/h in just 8.3 seconds, with a combined fuel consumption as low as 6.9 liters per 100 km, while the 2.0L model achieves a combined fuel consumption of only 6.3 liters per 100 km. 2. Exterior: The car adopts Mazda's KODO design philosophy, with a U-shaped front grille paired with LED headlights, enhancing its sporty appearance. The new model introduces an 11-speaker sound system. Compared to the previous generation Mazda6, the Atenza's wheelbase has been increased by 111mm, providing more spacious rear seating. The Atenza utilizes the Skyactiv chassis technology, equipped with a high-performance MacPherson strut front suspension and a multi-link independent rear suspension. Through structural optimization, it achieves both weight reduction and increased rigidity.
3
5
Share

What procedures are required to change a seven-seater to a four-seater?

Procedures for applying to change a seven-seater vehicle to a four-seater: You need to apply at the local vehicle registration office. Only after the application is approved can you drive on the road. If the application is not submitted, the vehicle will not pass the annual inspection. According to the relevant regulations of the traffic management department of the public security authority, the following actions require an application: 1. Changing the body color or replacing the engine, or altering the vehicle body or frame; 2. Changing the use nature of the vehicle, such as converting from a commercial motor vehicle to a non-commercial motor vehicle or vice versa. The application procedures are as follows: 1. The vehicle owner must submit an application to the local vehicle registration office; 2. An application for change registration must be submitted to the vehicle registration office within the specified time after the modification; 3. Before registration, the vehicle design drawings must be submitted, and any traffic safety violations or accidents must be resolved; 4. Failure to apply for the change may result in warnings or fines from the public security traffic management department.
20
1
Share

What are the benefits of having wider rear wheels than front wheels?

The benefits of having wider rear wheels than front wheels include reducing power loss, improving vehicle handling during turns, and enhancing visual appeal. Below is a detailed introduction to the advantages of wider rear wheels: 1. Reducing power loss. The primary purpose is to minimize power loss. Since rear-wheel-drive vehicles primarily transmit power through the rear wheels, wider tires increase the contact area with the ground, thereby providing greater traction. This prevents wheel spin during acceleration, which would otherwise lead to power loss. 2. Improving handling during cornering. A larger contact area with the ground enhances the vehicle's handling in corners. For example, during emergency braking, the additional tread grooves act like powerful suction cups, firmly gripping the ground and ensuring stability even on slippery surfaces. 3. Enhancing sporty visual appeal. Visually, wider tires are more appealing. With a lower aspect ratio, the rubber tread appears thinner while the wheel rims look larger, creating a more sporty visual effect.
8
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.