How are autonomous driving levels classified?

How to Determine the Quality of Engine Oil?

You can determine the quality level of engine oil from the specifications on the oil packaging. Taking "0W-40 API SN/CF" as an example, the first part "0W40" is the main grade. The smaller the number before the "W," the better the low-temperature fluidity, which provides better engine protection. "0W" indicates that the oil can be used at temperatures as low as -35°C. The number "40" after the "W" represents the viscosity index of the oil at high temperatures. The higher the number, the higher the viscosity, which also means better engine protection. Here are methods to determine the quality of engine oil: 1. Listen to the engine sound after adding oil: If, after driving a few hundred kilometers, the engine sound becomes smoother and quieter, and the vibration stabilizes, it indicates good oil quality. Conversely, if the engine sound becomes louder, duller, or the vibration increases, the oil may be problematic. 2. Observe the color and smell of the oil: High-quality oil is light in color, transparent, free of impurities, suspended particles, or sediment, and flows well when shaken. The more transparent the oil, the higher its quality. Fake oil often has a pungent smell due to inferior raw materials or processes, while genuine oil does not. 3. Observe in low temperatures: Since engine oils vary in low-temperature performance, seal a small bottle of oil and place it in a freezer set to -18°C. After 6 hours, check its fluidity. High-quality oil will flow noticeably better, indicating better engine protection in cold conditions. 4. Shake and observe: Pour the oil into a bottle and shake it vigorously until many bubbles form. Then observe how quickly the bubbles disappear. Higher-grade, better-quality oil will see bubbles dissipate faster. If bubbles persist, the oil may be problematic. 5. Check fuel consumption after adding oil: Qualified oil, due to its superior lubrication, anti-wear, and cleaning properties, reduces friction in engine components, leading to better fuel efficiency. If fuel consumption increases significantly after adding new oil, the oil may be of poor quality.

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How to Distinguish Whether a Vehicle is China III, China IV, or China V?

Methods to distinguish whether a vehicle is China III, China IV, or China V include: 1. The vehicle's factory certificate clearly indicates the standard; 2. Check the engine emission label; 3. The annual inspection label clearly indicates the standard; 4. Visit the Motor Vehicle Environmental Protection Website, enter the engine number and manufacturer name for new vehicle certification, and search for the vehicle's certification announcement, which explicitly states the emission standard. China III, China IV, and China V are common terms for China's various stages of vehicle emission standards. China III refers to the third stage of China's vehicle emission standards, which upgraded and modified the engine and exhaust system to reduce pollutant emissions, added vehicle self-diagnosis systems, and improved the three-way catalytic converter. China IV is the fourth stage of China's vehicle emission standards, which upgraded the post-emission treatment system compared to China III, reducing pollutant emissions by 50% to 60%. China V is the fifth stage of China's vehicle emission standards, imposing stricter limits on vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter. Compared to China IV, the China V standard requires a 25% reduction in nitrogen oxide emissions and adds emission limits for non-methane hydrocarbons and PM, further reducing atmospheric pollution.

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Should Automatic Transmission Cars Shift to Neutral at Traffic Lights?

Automatic transmission cars should shift to neutral when waiting at traffic lights, and using the handbrake will provide additional safety. More detailed information is as follows: 1. Waiting at traffic lights in D gear with the foot brake engaged causes the passive wheel in the torque converter between the engine and transmission to remain fixed, generating a reaction force on the driving wheel, which increases the engine load. This can be understood as hindering engine operation. As a result, the engine ECU increases fuel injection, leading to higher fuel consumption, which is why you can see a high instantaneous fuel consumption when braking to a stop. 2. It is not recommended to wait at traffic lights in P gear because shifting from P to D gear can sometimes cause the car to reverse, affecting the vehicle behind and potentially leading to a rear-end collision, for which you may also bear some responsibility. 3. Some vehicles now come with an "autohold" function, which is an automatic handbrake. After pressing the button to activate this function, the car will automatically brake once it comes to a stop, eliminating the need to shift between reverse and drive gears, and the vehicle will remain in a parked state. However, not shifting to neutral still poses certain safety risks, such as the car accelerating rapidly if the accelerator is mistakenly pressed, which could lead to a collision. Additionally, the auto start-stop function is also suitable for use at traffic lights, as it helps save fuel to some extent, and the engine, when turned off, does not emit exhaust fumes into the car.

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What are the effects of changing from 50 to 55 tires?

Switching to tires with a 55% aspect ratio provides more comfort because tires with higher smoothness have longer sidewalls and stronger cushioning capacity, making them relatively more comfortable. However, the road feel may be poorer, and the lateral resistance during turns is weaker. Conversely, tires with a low aspect ratio and large inner diameter have shorter sidewalls and wider treads, resulting in a larger contact area and greater pressure-bearing capacity. These tires are more responsive to road conditions, offering stronger lateral resistance during turns and enhanced vehicle handling. Regardless of the type of tires you switch to, the following points should be noted during daily use: Regularly inspect the tire surface for cracks, deformations, or other defects. Due to wear from driving, the tread grooves gradually become shallower. If the tread is worn flat, it loses its drainage and anti-slip functions, significantly reducing the vehicle's performance. Small cracks may also pose a risk of tire blowouts at high speeds. Additionally, promptly remove pebbles lodged in the grooves. Try to park on level ground. Avoid parking on roads with thick, sharp, or pointed stones. Do not park near or in contact with petroleum products, acids, or other materials that may deteriorate rubber. After parking, avoid turning the steering wheel, as this accelerates tire wear. Do not splash water to cool the tires. In hot weather or during high-speed driving, tires are prone to overheating, and the air pressure may increase. In such cases, stop to allow the tires to cool naturally. Never release air to reduce pressure or splash water to cool the tires, as this may cause abnormal aging of the tread rubber. Avoid sudden braking. Minimize frequent or hard braking to prevent accelerated tread wear caused by dragging between the tires and the road.

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How to Release a Locked Rear Wheel on a Car?

Start the vehicle, then adjust the gear to put the car in a braking state. After that, move the vehicle forward and backward repeatedly about three times. Pour boiling water at 100°C onto the brake pads, then repeat the forward and backward movements again.

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How to charge the Benben EV?

Introduction to charging methods for the Benben EV: There are several charging methods available: wall-mounted charging stations, public charging stations, and portable chargers included with the vehicle. It is also possible to charge using a standard 220V household power supply, which may take around 11 hours for a full charge. Professional charging stations, on the other hand, can typically charge the vehicle in about half an hour. There are three main charging methods for new energy vehicles: public charging stations, home charging stations, and portable charging. Below are detailed introductions to each method: 1. Public charging stations: Public charging stations generally offer fast charging (DC) and slow charging (AC). As the names suggest, fast charging provides more power in a shorter time, while slow charging delivers less power and takes longer. Public charging stations are more common in first-tier cities, whereas they are relatively scarce in third- and fourth-tier cities, making charging less convenient. The availability of public charging stations may vary by city, so it is advisable to check the local situation. 2. Home charging stations: To use this method, a charging station must be installed at home. Installation requires coordination with the property management to ensure compliance with community regulations. After obtaining approval from the property management, further permissions from the fire department and civil defense office are necessary, followed by an on-site inspection by the power supply department. 3. Portable charging: Portable charging involves using the portable charging cable provided with the vehicle to connect to a standard household power outlet. The advantage of this method is convenience, as charging can be done wherever there is an outlet. However, the downside is the very slow charging speed. For example, charging a vehicle with a 57kWh battery and a 300km range can take nearly 20 hours for a full charge.

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How are autonomous driving levels classified?

How to Determine the Quality of Engine Oil?

How to Distinguish Whether a Vehicle is China III, China IV, or China V?

Should Automatic Transmission Cars Shift to Neutral at Traffic Lights?

What are the effects of changing from 50 to 55 tires?

How to Release a Locked Rear Wheel on a Car?

How to charge the Benben EV?

What Could Be the Reason When the Car Shows No Response at All When Starting?

What does Dynamic mean on a Mercedes-Benz?

What to Do If a Gasoline Car Accidentally Adds a Small Amount of Diesel?

Should You Check Engine Oil Level When the Engine is Cold or Hot?