How Does the Cooling System Work?

What does oil grade mean?

Oil grade is classified based on quality level and the kinematic viscosity grade of the oil at an engine temperature of 100 degrees Celsius. First, oil labeled with 'S' at the beginning is for gasoline engines, while oil labeled with 'C' is for diesel engines. The API grade represents the quality level of the oil, indicating its working capability. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and cushioning for the engine. It is often referred to as the 'blood' of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary component of the lubricant, determining its fundamental properties, while additives compensate for and improve any shortcomings in the base oil's performance, imparting new characteristics. Additives are an essential part of the lubricant.

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Which is the external circulation in car AM?

In car air circulation systems, 'A' stands for automatic control of the internal and external circulation, while 'M' represents the external circulation. When the 'A' button is activated, the air conditioning system automatically determines whether to use internal or external circulation based on the quality of the outside air. When the 'M' button is pressed, the car is in internal circulation mode if the light is on, and in external circulation mode if the light is off. The functions of internal and external circulation in a car are different: 1. External circulation function: It primarily serves to ventilate the car, replacing the internal air when it becomes stale. 2. Internal circulation function: When internal circulation is activated, the air inside the car does not exchange with the outside, circulating instead within a closed environment.

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What is the maintenance interval for SAIC Volkswagen vehicles?

SAIC Volkswagen vehicles generally have a maintenance interval of every 7,500 kilometers as specified by the manufacturer. This interval is determined based on various factors such as road conditions, air quality, fuel quality, and more. SAIC Volkswagen vehicle maintenance items include: Engine oil, oil filter, fuel filter, air filter, and cabin air filter. For vehicles that have traveled 60,000 kilometers, the transmission fluid typically only needs to be replaced every 100,000 kilometers, and some owners may even have transmission fluid that is maintenance-free for the lifetime of the vehicle. Engine spark plugs and timing belts can also last for over 80,000 kilometers. If spark plugs require maintenance, some engine cylinders may not fire properly, leading to symptoms such as engine shaking. The timing belt is a crucial component of the engine's valve train system, connected to the crankshaft to ensure proper engine intake and exhaust timing. After prolonged use, timing belts may break, and once damaged, they cannot be replaced by the owner. It is recommended to replace them approximately every 80,000 kilometers. Key points to note for vehicle maintenance: Regular tire pressure checks and adjustments are among the most important aspects of vehicle safety inspections. Insufficient tire pressure can lead to abnormal wear or internal tire damage, while excessive tire pressure makes the tires and rims more susceptible to deformation from impacts with uneven road surfaces and may even cause blowouts. Do not blindly pursue higher-octane gasoline. The octane rating is merely a parameter that indicates a gasoline's resistance to knocking and has no direct correlation with the cleanliness or fuel efficiency of the gasoline. Higher octane ratings do not necessarily mean better performance, and even high-end vehicles do not always require high-octane gasoline.

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How to Repair Minor Car Scratches?

Here are the methods to deal with scratches on your car: 1. Hairline scratches: For hairline scratches, polishing or applying a rubbing compound is usually sufficient to remove them. Simply wiping gently can make the hairline scratches disappear. 2. Light scratches: For light scratches, just prepare a tube of toothpaste. Toothpaste is very effective for shallow scratches that haven't damaged the car's primer. It works particularly well for removing traces left by other vehicles' paint during minor collisions or sticky residues from adhesive products. Most of these marks can be wiped away completely. 3. Moderate to deep scratches: Moderate and deep scratches cannot be repaired by polishing. If the dent area is small (not exceeding 5mm), you can level it with filler putty and then proceed with touch-up painting.

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What does Subject 3 test include?

Subject 3, which includes the road driving skills test and the safety and civilized driving knowledge test, is part of the motor vehicle driver's license assessment. It is the abbreviated term for the road driving skills and safety and civilized driving knowledge test subjects in the motor vehicle driver's examination. The specific details are as follows: 1. Road test content: The road driving skills test of Subject 3 generally includes: vehicle preparation, light simulation test, starting, driving straight, gear shifting operations, lane changing, pulling over, going straight through intersections, turning left at intersections, turning right at intersections, passing pedestrian crossings, passing school zones, passing bus stops, meeting vehicles, overtaking, making U-turns, and nighttime driving. 2. Theoretical content: The safety and civilized driving knowledge test of Subject 3 generally includes: safety and civilized driving operation requirements, safe driving knowledge under adverse weather and complex road conditions, emergency handling methods for situations like tire blowouts, and post-accident handling knowledge.

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What Are the Common Issues After Cleaning Fuel Injectors?

Common issues after cleaning fuel injectors include increased fuel consumption and higher idle speed. The working principle of fuel injector spraying is as follows: high-pressure fuel is pumped into the fuel injector supply port, creating high pressure inside the injector body that acts on the conical surface of the injector nozzle. When the fuel pressure exceeds the set value, the injector valve core opens, and high-pressure fuel is sprayed from the nozzle holes in a mist form into the engine cylinder for combustion, driving the piston's reciprocating motion. Common fuel injector faults and their solutions are: 1. Clogged nozzle holes: Use chromium oxide applied to a flat plate for grinding; if the cylindrical surface of the needle valve is significantly worn, it should be replaced promptly. 2. Poor sealing: Apply chromium oxide or toothpaste to the sealing band at the needle valve end. 3. Piston wear: Replace the piston.

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How Does the Cooling System Work?

What does oil grade mean?

Which is the external circulation in car AM?

What is the maintenance interval for SAIC Volkswagen vehicles?

How to Repair Minor Car Scratches?

What does Subject 3 test include?

What Are the Common Issues After Cleaning Fuel Injectors?

Is the Eclipse Cross engine imported?

Is Besturn a Joint Venture or Domestic Car?

What is Fuel Consumption Rate?

Should touch-up painting be done in a small or large area?