What car brand has a 'T' as its logo?

What Are the Standards and Classifications of Engine Oil?

The classification of engine oil typically follows two methods: viscosity grading and oil quality grading. Here are the detailed explanations: 1. SAE Viscosity Grading: According to the viscosity classification method, lubricating oils are divided into three types: high-temperature type for summer, low-temperature type for winter, and all-season type suitable for both winter and summer. (2) High-temperature type for summer: 20, 30, 40, 50. The larger the number, the higher the viscosity, and the higher the maximum applicable temperature. (2) Low-temperature type for winter: 0W, 5W, 10W, 15W, 20W, 25W. The symbol W stands for Winter, and the smaller the number before W, the lower the low-temperature viscosity, the better the low-temperature fluidity, and the lower the minimum applicable temperature. (3) All-season type: 5W-20, 5W-30, 5W-40, 5W-50, 10W-20, 10W-30, 10W-40, 10W-50, etc. The smaller the number before W, the lower the minimum applicable temperature of the oil, and the larger the number after W, the higher the maximum applicable temperature. Since this type of oil is suitable for various operating conditions, all-season oil is widely used and recommended by major automobile manufacturers. 2. Oil Quality Grading: API engine oils are divided into two categories: one is oil starting with S, which is suitable for gasoline engines, and the other is oil starting with C, which is suitable for both gasoline and diesel engines. (1) Oil starting with S: This type of oil starts with S, and the letters range from A to N. Each subsequent letter represents a higher grade than the previous one. For example, SN is a higher grade than SM. (2) Oil starting with C: This type of diesel engine oil follows a similar grading system as the S-grade oil. The further the letter is in the alphabet, the higher the oil grade.

10

0

Share

What does the tire pressure monitoring number mean?

The meaning of the tire pressure monitoring number is the air pressure value of the four tires. A tire pressure monitoring number around 2.5 BAR is considered normal. There are two types of tire pressure monitoring devices: Direct tire pressure monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire pressure. The pressure information is transmitted from inside the tire to a central receiver module via a wireless transmitter, and then the tire pressure data for each tire is displayed. When the tire pressure is too low or there is a leak, the system will automatically alert. Indirect tire pressure monitoring: The working principle of indirect tire pressure monitoring is: when the pressure of a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in its rotation speed being faster than the other wheels. By comparing the differences in rotation speeds between tires, the purpose of monitoring tire pressure is achieved. Indirect tire pressure warning systems actually rely on calculating the rolling radius of the tires to monitor pressure. Tire pressure standards are also related to the type of tire and the vehicle model. Different vehicle models have different weights, heights, and tire sizes, and thus require different tire pressures. Additionally, the pressure of a cold tire is different from that of a hot tire, with hot tires having about 20 kPa higher pressure than cold tires. The manufacturer's recommended value is the cold tire pressure, which is typically around 230 kPa to 250 kPa when the vehicle is cold, but the specific value should be based on the tire pressure marked for each vehicle. Furthermore, tire pressure is significantly affected by seasonal factors. In summer, high temperatures can cause tires to heat up during driving, and high pressure can easily lead to blowouts, so the pressure should be slightly lower. In winter, tire pressure is generally a bit higher than in summer due to thermal contraction and expansion, so a suitable tire pressure for cars in winter is usually between 250 kPa and 280 kPa. Hazards of overinflated tires: Reduced friction and adhesion of the tires, affecting braking performance; causing steering wheel vibration and deviation, reducing driving comfort; accelerating wear on the central tread pattern of the tire, shortening tire life; increasing vehicle vibration, indirectly affecting the lifespan of other components; causing excessive stretching and deformation of the tire cords, reducing tire elasticity, and increasing the load on the vehicle during driving. Hazards of underinflated tires: Increased friction coefficient with the road surface, leading to higher fuel consumption; causing heavy steering and deviation, which are factors detrimental to driving safety; increasing the movement of various parts of the tire, leading to abnormal heating due to excessive rolling; reducing the functionality of the cords and rubber, causing delamination or cord breakage and excessive friction with the rim, damaging the bead area and causing abnormal wear; exponentially increasing friction between the tire and the ground, rapidly raising tire temperature, softening the tire, and drastically reducing its strength. High-speed driving under these conditions may lead to blowouts.

12

4

Share

What Does It Mean When the Engine Warning Light on the Dashboard Comes On?

The engine warning light may come on due to the following 7 main reasons: Sensor malfunction: The sensors involved include those for coolant temperature, crankshaft position, air flow, intake temperature, oxygen, etc. When these sensors are damaged, have poor contact, or their signals are interrupted, the vehicle's ECU cannot accurately obtain engine data, which triggers the engine warning light. Fuel or oil quality issues: Failure to use the fuel or engine oil as recommended by the manufacturer may cause engine wear, leading to the warning light illuminating. Poor fuel mixture combustion: Poor combustion can cause engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will turn on as an alert. Issues such as faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can all lead to poor fuel mixture combustion. Turbocharger problems: Issues with the intake boost pipes or turbocharger can also trigger the engine warning light. The most common problem is a damaged turbocharger, often accompanied by symptoms like oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake problems: If there are issues with the vehicle's air intake, it may lead to clogged engine pipes, and in severe cases, the engine warning light will come on. A dirty air filter that hasn't been cleaned regularly can cause intake problems. Exhaust problems: Exhaust system faults can also trigger the engine warning light. Common causes include faulty rear oxygen sensors, catalytic converters, exhaust camshafts, or bearings, with the catalytic converter being the most frequent issue. Using leaded gasoline, lead- or silicon-containing lubricant additives, physical damage to the catalytic converter, or fuel system malfunctions can all lead to catalytic converter failure. Anti-theft system malfunction: If the vehicle's electronic anti-theft system malfunctions or if there is a mismatch between the anti-theft controller and the engine control unit, the anti-theft system may prevent the engine from operating normally, accompanied by the illumination of the engine warning light. If the engine warning light comes on, follow these steps: First, check if the engine is running normally. Look for symptoms like shaking or black smoke. If present, avoid restarting the engine. Note: Never restart the engine if the light is red. If the engine can be started, turn it off and wait 5-10 minutes. Without pressing the brake, press the start button or turn the key halfway to the 'ON' position (without pressing the clutch). The vehicle will perform a self-check. After 5-10 seconds, observe if the warning light turns off. If the light remains on, visit a service center as soon as possible. Technicians can use a diagnostic tool to read the fault code, identify the issue, and perform targeted repairs.

4

Share

Do I need to wait for the red light to make a U-turn at a designated area?

If there is no U-turn indicator light, and the gap is marked with a dashed line, the U-turn is not affected by the left-turn signal light and does not require crossing the pedestrian crossing. If the gap is marked with a solid line, then the U-turn must cross the pedestrian crossing and is subject to the left-turn signal light. Making a direct U-turn may result in being photographed or penalized by on-site traffic police. If you need to cross the pedestrian crossing to make a U-turn, you must yield to pedestrians: Pedestrians walking on the right side of the road's crosswalk, not reaching the centerline of the road. Vehicles driving on the left side of the road should slow down and ensure safety before proceeding through the crosswalk. Pedestrians waiting outside the boundary line between motorized and non-motorized lanes. If they have not entered the roadway, vehicles should slow down and ensure safety before proceeding through the crosswalk. When pedestrians cross the boundary line between motorized and non-motorized lanes, vehicles that do not stop and yield are committing a violation and should be penalized. When pedestrians enter the motorized lane along the crosswalk, the motorized vehicle should slow down and ensure safety before proceeding through the crosswalk. If the vehicle does not stop and yield, it is committing a violation and should be penalized. Pedestrians waiting at the centerline of the road without entering the motorized lane. If vehicles do not stop and yield, it is a violation and should be penalized. Pedestrians crossing the centerline of the road and entering the lane. If vehicles do not stop and yield, it is a violation and should be penalized. When the road is divided by a green belt, pedestrians waiting in the middle of the road must be yielded to. Vehicles should slow down and ensure safety before proceeding through the crosswalk. Scenarios where U-turns are allowed: If there is a U-turn sign at the intersection, you can make a U-turn. If there is a U-turn signal light, follow its instructions. If there is no signal light, make the U-turn based on the specific situation without obstructing other vehicles or pedestrians. If there is no explicit prohibition of U-turns or left turns at the intersection, U-turns are allowed. "No explicit prohibition" means there are no "No U-turn" or "No Left Turn" signs, and the centerline is not solid. U-turns are also allowed in yellow grid zones. Yellow grid lines indicate no-parking zones at intersections prone to congestion due to temporary stops. While vehicles cannot stop in these zones, they can make U-turns if there is no central barrier. If there is a U-turn signal light at the intersection, follow it—only proceed on green. If "No Left Turn" and "U-turn Allowed" signs appear together, U-turns are allowed, but left turns are prohibited. Note that "No U-turn" does not mean "No Left Turn." Precautions when making a U-turn at an intersection: Observe road markings. If the line is solid, U-turns are prohibited under any circumstances. Continue driving to find a suitable U-turn location. If there is a "No Left Turn" sign ahead, even if there is no explicit "No U-turn" sign, U-turns are not allowed at that intersection because U-turns inherently involve a left turn. U-turns must be made from the innermost left-turn lane. If you are in the second left-turn lane, you cannot make a U-turn at that intersection. Always yield to vehicles going straight before making a U-turn. If you interfere with straight-moving traffic, you will bear full responsibility for any accidents. Near the intersection stop line, lanes usually have guiding arrows. The leftmost lane is not always a left-turn lane. If it has a straight arrow, U-turns are prohibited even if there are no explicit "No U-turn" signs.

17

1

Share

How to Deal with Long Scratches on Car Paint?

Methods for dealing with long scratches on car paint: 1. Hairline scratches, which can usually be removed by polishing or gently wiping with a polishing compound; 2. Light scratches, for which you only need a tube of toothpaste. Toothpaste is very effective for shallow scratches that have not damaged the car's primer; 3. Moderate to deep scratches, which cannot be repaired by polishing. If the dent area is small and does not exceed 5mm, it can be leveled with filler putty before repainting; 4. Deep scratches, for which severe deformation requires bodywork. The treatment of scratches places relatively high demands on the technician's skills.

8

4

Share

What are the factors affecting braking distance?

Factors affecting braking distance include driving speed, road conditions, driver condition, tire condition, and vehicle condition. Below is an introduction to automotive brakes: 1. Introduction: Automotive brakes are the braking devices of a vehicle, and almost all brakes used in vehicles are friction-based. 2. Categories: They can be divided into two main types: drum brakes and disc brakes. In drum brakes, the rotating element of the friction pair is the brake drum, with its working surface being cylindrical; in disc brakes, the rotating element is the rotating brake disc, with its working surface being the end face. 3. Function: Automotive brakes are components that generate forces (braking forces) to resist vehicle movement or the tendency of movement, including retarders in auxiliary braking systems.

2

5

Share

What car brand has a 'T' as its logo?

What Are the Standards and Classifications of Engine Oil?

What does the tire pressure monitoring number mean?

What Does It Mean When the Engine Warning Light on the Dashboard Comes On?

Do I need to wait for the red light to make a U-turn at a designated area?

How to Deal with Long Scratches on Car Paint?

What are the factors affecting braking distance?

How to Clean a Dirty Car Roof Liner?

What happens if the tire pressure is too high?

How to Reset the Tire Pressure Light on Volkswagen Golf 7?

Can National 5 Vehicles Be Transferred to Hainan?