What does the 'w' in motor oil specifications mean?

Will Factory Paint Naturally Crack?

Factory paint will not naturally crack. However, if corrosive substances adhere to the car's surface and are not removed for a long time, it can cause the paint to crack. Below are some extended tips on car maintenance: 1. Regular Inspection: Periodically check the car's paint surface. If cracks or scratches are found, address them promptly to prevent further damage from wind and sun exposure. For minor scratches or chips, the usual treatment involves sanding the surface with water sandpaper, then applying a professional touch-up paint pen or using the auxiliary paint provided by the manufacturer. 2. Avoid Using Car Covers for Heat Protection: Using a car cover can cause friction between the paint surface and the cover's interior, especially in breezy conditions, which can inadvertently wear down the paint surface. 3. Avoid Repainting Unnecessarily: Some owners, upon noticing minor scratches, opt to repaint the entire car. This is not advisable. Firstly, it is economically inefficient. Secondly, repainting involves sanding down the existing paint, reapplying new paint, and resealing, which is time-consuming and labor-intensive. Additionally, repainted surfaces often lack the natural look and gloss of the original factory paint.

17

5

Share

How Many Kilometers Should a Car Go Between Maintenance Services?

Typically, a minor maintenance service is recommended every 7,000 kilometers, while a major maintenance service is advised around 14,000 kilometers. However, the specific intervals should be determined based on the actual condition of the vehicle. Below is more related information: 1. Car Maintenance: Car maintenance refers to the preventive work of regularly inspecting, cleaning, replenishing, lubricating, adjusting, or replacing certain parts of the car, also known as car servicing. 2. Engine Oil Change: The replacement cycle and quantity of engine oil are of particular concern to many. The most straightforward approach is to refer to the vehicle's maintenance manual, which usually provides clear instructions. However, many people have lost their maintenance manuals long ago. Generally, the engine oil should be changed every 5,000 kilometers, but the exact replacement cycle and quantity should be determined based on the specific model information. 3. Antifreeze Usage Tips: It is best to use antifreeze throughout the year. In addition to its antifreeze and cooling functions, antifreeze also has cleaning, rust removal, and anti-corrosion effects, reducing corrosion in the radiator and protecting the engine. Pay attention to selecting the correct color of antifreeze and avoid mixing different types. 4. Brake Fluid Usage Tips: The functionality of the brake system is closely related to the brake fluid. When inspecting or replacing brake pads, brake discs, and other hardware, do not forget to check whether the brake fluid needs to be topped up or replaced.

10

3

Share

What causes slow throttle return?

Slow throttle speed return may be caused by excessively rich air-fuel mixture in the engine or malfunctioning sensors. Here is relevant extended information: 1. Principle: The normal operation of a car engine relies on numerous sensors and electronic devices. If certain sensors malfunction, it may affect the engine's normal operation. Sensors around the engine include oxygen sensors, air flow sensors, intake air temperature sensors, camshaft position sensors, coolant temperature sensors, etc. If any sensor malfunctions, it may cause the engine's air-fuel mixture to become too rich, resulting in almost no reduction in engine speed when releasing the throttle pedal. 2. Maintenance: During routine maintenance, technicians can use diagnostic computers to check for fault codes in the vehicle. This way, any issues with the electronic systems can be immediately identified. A car is not just a simple mechanical product but a complex high-tech device equipped with numerous electronic components and sensors. The proper functioning of a car depends on these electronic devices and sensors.

16

3

Share

Why does the car suddenly stall and fail to start?

The car suddenly stalling and failing to start can be caused by several reasons: a dead battery, obstructed fuel flow (avoid waiting until the fuel is almost empty to refuel), poor ignition system performance. It could also be due to starter motor failure, fuel pump or injector issues, sensor malfunctions, etc. For these more complex situations, professional assistance is required. Below are more related explanations: Reasons why the car suddenly stalls and fails to start: 1. Fuel exhaustion: Failing to monitor the fuel tank usage, with the fuel gauge showing below the red line, naturally makes it impossible to start. 2. Dead battery: This could be due to leaving the headlights on for an extended period or the battery reaching the end of its lifespan. It is generally recommended to replace the battery every 2 years. Additionally, installing xenon headlights, high-power audio systems, or DVD players can also cause vehicle electrical circuit issues. Checking for a dead battery is simple—just press the horn to find out. 3. Incorrect gear position: For automatic transmission vehicles, the gear must be in P (Park) or N (Neutral) to start. If it is in R (Reverse) or D (Drive), the car will not start. Some manual transmission vehicles may also fail to start if the clutch is not depressed.

2

4

Share

Is a Fuel Consumption of 9.0 High?

Normally, a fuel consumption of 9.0 is considered average for most vehicle models. Below is a brief introduction about gasoline: 1. Basic Information: Gasoline is a volatile, flammable hydrocarbon mixture liquid obtained from petroleum through distillation and cracking, used as fuel. It appears as a transparent liquid, is flammable, and has a distillation range of 30°C to 220°C. 2. Composition: The main components are C5 to C12 aliphatic hydrocarbons and cycloalkanes, along with a certain amount of aromatic hydrocarbons. Gasoline has a high octane number (anti-knock combustion performance) and is classified into grades such as 89, 90, 92, 93, 95, 97, and 98 based on octane ratings. Starting from January 2012, the gasoline grades 90, 93, and 97 were revised to 89, 92, and 95.

5

3

Share

Will it have any impact if I suddenly switch from Sinopec to PetroChina?

This will not have any impact. Compared to PetroChina, Sinopec's fuel uses higher-priced additives during the refining process, resulting in a purer final product. For vehicles, this is better because higher purity means the fuel burns more efficiently. However, since both companies adhere to the same final gasoline standards, mixing them poses no issues. Compared to GB17930—2011, the main changes can be summarized as 'three reductions, two adjustments, and one addition.' Details are as follows: 1. 'Three reductions': The sulfur content limit was reduced from 50μg/g in Phase IV to 10μg/g, an 80% decrease; the manganese concentration limit was reduced from 8mg/L in Phase IV to 2mg/L, prohibiting the artificial addition of manganese-containing additives; and the olefin content was reduced from 28% in Phase IV to 24%. 2. 'Two adjustments': Adjustments were made to vapor pressure and fuel grades. The lower limit of winter vapor pressure was increased from 42kPa in Phase IV to 45kPa, while the upper limit of summer vapor pressure was reduced from 68kPa in Phase IV to 65kPa, with Guangdong, Guangxi, and Hainan required to follow summer vapor pressure year-round. Additionally, considering the reduction in octane levels due to lower sulfur and banned manganese content, as well as the shortage of high-octane resources domestically, the standard adjusted gasoline grades from 90, 93, and 97 to 89, 92, and 95, respectively, based on the realities of the refining industry. 3. 'One addition': The standard's appendix now includes technical requirements and testing methods for 98-octane gasoline (V). It is estimated that implementing 'Automotive Gasoline' (GB17930—2013) will significantly reduce vehicle pollutant emissions, with an annual reduction of approximately 300,000 tons of nitrogen oxides for in-use vehicles and a cumulative reduction of about 90,000 tons over five years for new vehicles.

15

3

Share

What does the 'w' in motor oil specifications mean?

Will Factory Paint Naturally Crack?

How Many Kilometers Should a Car Go Between Maintenance Services?

What causes slow throttle return?

Why does the car suddenly stall and fail to start?

Is a Fuel Consumption of 9.0 High?

Will it have any impact if I suddenly switch from Sinopec to PetroChina?

Is There Any Impact When the Left and Right Tire Pressure Differs by 15?

Should You Pull the Clutch When Making a U-turn on a Motorcycle?

What are the pre-driving inspection items?

What is the difference between paint protection film and ceramic coating?