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Is 30 or 40 better for engine oil in the south?

1 Answers
SanMelanie
07/30/25 5:50am
5w30 is better for engine oil in the south. Compared with 10w40, 5w30 has better cold start performance and lower viscosity, while 10w40 has poorer cold start performance and higher viscosity. Advantages of viscosity: higher viscosity oil has better sealing performance, but the engine will consume more fuel. At idle, higher viscosity oil results in lower noise, while under driving conditions, higher viscosity oil leads to higher noise. Lower viscosity oil has the characteristic of fuel efficiency. Recommendations for cold weather use: If SAE10W-30 or higher viscosity engine oil is used in cold weather, the engine may be difficult to start, so it is recommended to use SAE0W20, 5W20, or 5W30 engine oil. Relatively speaking, using 0W-20 oil can maximize fuel savings.
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What are the symbols for internal and external air circulation in a car?

Internal air circulation is symbolized by a closed car interior with a circular arrow; external air circulation is represented by an open car with an air arrow pointing into the vehicle. External circulation mode uses a fan to draw outside air into the car, meaning the air passage between the exterior and interior is open. Even when the fan is off, airflow is still drawn into the car while driving, replenishing fresh air inside. Internal circulation mode closes the airflow passage between the inside and outside of the car. Without the fan, there is no airflow circulation, and when the fan is on, the airflow drawn in comes solely from inside the car, creating internal air circulation. Internal circulation primarily serves to promptly and effectively block external dust and harmful gases from entering the car, such as when driving through areas with smoke, dust, strong odors, or in heavy traffic, preventing harmful exhaust emissions from preceding vehicles.
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What does AC mean in a car?

Car's A/C refers to the air conditioning regulation system. Below are the introduction and precautions regarding A/C: A/C in cars: It can be understood as air control or air conditioning, achieving cooling or heating through different operation modes of the air conditioning compressor, hence it has dual meanings of cooling and heating. After pressing the A/C button, the air conditioning starts to adjust the temperature according to the set value, and the air conditioning compressor will activate. If the car has been exposed to the sun for a long time outdoors, the correct approach is to first open the windows, turn on the air conditioning's external circulation mode to expel the hot air inside the car, wait for a few minutes, then turn on the A/C switch and set the circulation mode to internal circulation. Precautions for A/C in cars: In summer, the car's air conditioning must have A/C turned on; otherwise, the air blown out won't be cold. To quickly lower the temperature inside the car in summer, you can adjust the position of the air vents. According to the principle of air convection, hot air rises while cold air sinks. The air conditioning vents should be directed slightly upwards, utilizing the principle that hot air rises and cold air sinks. As the cold air descends, it can rapidly cool the interior of the car. Also, avoid placing decorations in front of the air conditioning vents as they can affect the cooling efficiency.
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Why does the wiper make a squeaking noise when wiping the windshield?

Reasons and solutions for the squeaking noise when the wiper wipes the windshield: 1. Accumulation of dirt on the wiper, the solution is to remove foreign objects and dirt; 2. The wiper jumps on the windshield when moving in a certain direction and cannot maintain the correct angle with the windshield through normal deformation, the solution is to adjust the angle of the wiper; 3. There is oil stain on the front windshield, and the wiper cannot adhere closely to the glass, the solution is to spray cleaner on the glass surface and activate the wiper for cleaning. The wiper, also known as the windscreen wiper or windshield wiper, is a device used to remove raindrops and dust attached to the vehicle's windshield to improve the driver's visibility and enhance driving safety.
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How many meters can be captured for solid line lane changing?

If all factors are not considered and under good lighting conditions, solid line lane changing can be captured at 300 meters, but to clearly capture the license plate, the range is limited to within 100 meters. The pixel resolution of intersection surveillance cameras on roads typically ranges between 5 million to 10 million pixels. Vehicles that arbitrarily cross solid yellow lines and drive in the opposite direction can be fined 200 yuan and receive 3 penalty points. Motor vehicle drivers who violate road traffic safety laws and regulations regarding road traffic rules may be given a warning or fined between 20 and 200 yuan. Both single and double solid yellow lines are considered prohibited markings, and driving over or crossing these lines during operation constitutes a violation of the law.
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How to distinguish between internal and external circulation with one button?

Method to distinguish between internal and external circulation with one button: Press the air circulation button, the light on indicates internal circulation, and the light off indicates external circulation, meaning turning off internal circulation switches to external circulation. Car air conditioning generally includes cooling devices, heating devices, and ventilation devices, with modes divided into internal circulation and external circulation. Internal circulation is typically used during traffic jams. When turning on the cooling air conditioning, first activate internal circulation to lower the temperature inside the car, then switch to external circulation after some time. Internal circulation means air circulates only inside the car, driven by the blower to cycle the interior air. External circulation connects the interior with the outside; while driving, airflow automatically draws in outside air due to wind pressure, and when stationary, outside air can still enter the blower through the air ducts and be blown into the car.
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What is the icon for the rearview mirror heating button?

The rearview mirror heating symbol is a pattern of three curved upward arrows combined with a rectangle. The location of the rearview mirror heating switch varies among different car models, but the symbol is generally similar. Rearview mirror heating is particularly useful in rainy or snowy weather. When activated, the heater behind the mirror quickly warms the mirror surface, gradually removing rainwater or fog, eliminating the need for the driver to manually wipe the mirror frequently and reducing driving hazards. How to use the rearview mirror heating function: There are generally two ways to activate the rearview mirror heating function. One is combined with the electric rearview mirror adjustment button—simply rotate the knob to turn it on. The other is located on the air conditioning control panel—press the heating button to activate it. No manual angle adjustment is needed, as the driver's side has a dedicated adjustment button. Principle of the rearview mirror heating function: After rotating the button, the electric heater behind the rearview mirror glass rapidly heats up to a fixed temperature within a few minutes, typically between 35-60 degrees Celsius. The heat is then distributed across the left and right rearview mirrors. As the temperature rises and evaporation occurs, water droplets on the mirror surface gradually shrink, and fog slowly dissipates, effectively defrosting and de-fogging the mirror. However, if the rainfall is particularly heavy, the effect may diminish and become less noticeable. Precautions for using the rearview mirror heating function: The principle of rearview mirror heating involves adding electric heating wires to the mirror. These wires consume a significant amount of power, so it is essential to ensure the car is running when using this function. Avoid activating rearview mirror heating while the car is stationary to prevent draining the battery, which could leave insufficient power to start the car. Other methods for defogging rearview mirrors include: Opening windows for air circulation: Crack open the side windows slightly to allow air exchange between the inside and outside of the car, reducing the temperature difference and gradually eliminating fog. Adjusting the car's air conditioning to the appropriate setting to blow warm air for defogging.
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