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What is Semi-Synthetic Engine Oil?

1 Answers
SanGrace
07/30/25 4:13am
Semi-synthetic engine oil is a lubricant formulated from Group III base oils, which is a purified product derived from mineral oil through hydrocracking technology. Specifically, it is made by blending mineral oil and fully synthetic oil in a 4:6 ratio, with the addition of certain additives. Here are some relevant details: 1. Semi-synthetic engine oil is generally suitable for mid-to-low-end naturally aspirated engine models. As long as it's not for turbocharged engines or high-end, large SUV models, semi-synthetic oil can be used. 2. The replacement cycle for semi-synthetic oil is approximately 8 months, typically around 7,000 kilometers. There is no fixed interval for oil changes; it depends on the actual driving environment and habits. In harsher driving conditions, an earlier replacement is necessary, and the type of oil used should also refer to the recommendations in the vehicle's maintenance manual.
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What is the working principle of an evaporator?

The working principle of an automobile evaporator: The liquid refrigerant enters through the feed port, while the heating steam heats the heating tube bundle inside the heating chamber. The thicker tube in the middle of the heating chamber, due to its smaller heating area compared to the heating tube bundle, causes the refrigerant vaporized by the heating tube bundle to rise and enter the evaporation chamber. Below are related introductions: 1. Definition of the evaporator: The evaporator is a device used to heat the refrigerant and absorb heat from the external environment, mainly composed of a heating chamber and an evaporation chamber. 2. Application in thermal units: In fresh air heat exchange units and fan coil units, the evaporator primarily provides chilled water during the cooling process and heated refrigerant during the heating process. 3. Application in ground source heat pump systems: Its role in ground source heat pump systems is opposite to that of the condenser. During the heating process of the ground source heat pump unit, the evaporator acts as a ground source side device, heating the circulating water on the ground source side. The heated water is then transferred to the condenser through heat exchange in the unit, where the heat from the hot water is discharged by the condenser.
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What do 4L and 4H mean in 4WD vehicles?

4H and 4L are two modes available in four-wheel-drive vehicles. 4H stands for four-wheel-drive high-speed mode, while 4L stands for four-wheel-drive low-speed mode. These two drive modes have certain differences in controlling the transmission and are used in different scenarios. Properly utilizing the four-wheel-drive modes according to terrain can not only improve the vehicle's off-road capability but also reduce fuel consumption to some extent. Usage scenarios for 4H and 4L modes: 1. Slippery surfaces: If driving on snow or slippery roads, the 4H mode is very suitable, as it ensures sufficient drive wheels while avoiding excessive driving force that could cause wheel slip. 2. Climbing: Due to its strong driving force, the 4L mode can be used when climbing slopes or during off-road driving, maximizing the vehicle's power. 3. High-speed driving: High-speed four-wheel drive is not suitable for highway driving. For part-time four-wheel-drive vehicles, dry paved roads are not suitable for 4H or 4L modes; only the 2H mode should be selected.
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What documents are needed for car transfer?

The seller needs to prepare the original ID card of the vehicle owner, vehicle registration certificate, vehicle license, original purchase invoice or transfer invoice of the vehicle, and the buyer needs to provide the original ID card of the buyer. Some regions also require a "vehicle purchase quota". The procedures for car transfer are as follows: 1. Obtain the form: obtain and fill out a copy of the motor vehicle change, transfer, modification, suspension, or scrapping approval form. 2. Stamp: affix the same seal as the original registration, and private vehicles must submit the owner's ID card for verification. 3. Review: go to the vehicle management section of the traffic police detachment and submit the documents to the registration acceptance counter for review by the handling officer. 4. Inspection: vehicles that meet the transfer conditions will be sent to the motor vehicle inspection counter for inspection and confirmation. 5. Payment: after passing the inspection, for transfers or changes within the same county or city, go directly to the license plate management counter to wait for notification and pay the fee. 6. Tax payment: the transaction tax is issued by the used car trading center and is charged at 1.48% of the vehicle's estimated value.
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How to Transfer a Driver's License to Your Place of Residence?

Here is the relevant information for handling the transfer and renewal of a motor vehicle driver's license: 1. Required materials: (1) Original ID card and a copy, two one-inch color photos. (2) Proof of household registration transfer and transfer order from the labor and personnel department. (3) Submit the original driver's license and file for approval by the business leadership post. The clerk will unseal the file, review whether the file materials are complete and valid, and process the transfer after online verification. (4) Retain the "Motor Vehicle Driver's License Application Form," "Motor Vehicle Driver's License Registration Item Form," and "Motor Vehicle Driver Transfer Notice" from the original driver's license file. 2. Prerequisites: (1) Query the national public security traffic management information system to compare and confirm that the applicant's information and driver's license information are true and valid. (2) The motor vehicle driver does not have a situation where the driver's license has been revoked, canceled, or invalidated according to the law. (3) The motor vehicle driver's accumulated points have not reached the full score.
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Is the environmental protection label no longer required for vehicle inspections now?

The latest policy states that the vehicle annual inspection and environmental protection inspection labels have been merged. The exhaust emission test for motor vehicles will continue as usual. As long as the vehicle passes the annual inspection, there is no need to obtain a separate environmental protection label. For vehicles registered in 2021, only the annual inspection label is required. Currently, annual inspection labels are connected with the traffic police system, and electronic labels can be checked online, eliminating the need to display them on the windshield. Below is relevant information: 1. Annual inspection procedures: The vehicle owner needs to fill out the 'Motor Vehicle Annual Inspection Form' and then send the vehicle to the designated location for inspection on the date specified by the local vehicle management office. If the vehicle passes the inspection, the vehicle management authority will affix a qualified stamp on the driving license and the 'Motor Vehicle Annual Inspection Form'. 2. Special circumstances: Vehicles that cannot undergo the annual inspection on schedule due to special circumstances should apply for an extension in advance with the local vehicle management office. 3. Out-of-town inspections: For out-of-town inspections, the vehicle owner needs to submit an application, which will be forwarded by the original vehicle management office to the local vehicle management office for inspection. After the inspection, the results will be reported back to the original vehicle management office.
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What does 10w/40 written on the front of the engine oil mean?

The 10W-40 marked on the bottle represents the viscosity grade of the lubricating oil product (indicating better fluidity at low temperatures and better viscosity at high temperatures). For detailed information, please see below: 1. The American Petroleum Institute classifies engine oils into different grades based on their quality levels: This standard uses the letter "S" to represent gasoline engine oils, and different grades are arranged in alphabetical order after the letter "S", such as SE, SF, SG, SH, SJ. The letters following "S" indicate higher oil grades as they appear later in the alphabet. 2. Classification of oil quality by viscosity grade: (1) The first category is single-grade viscosity, which is further divided into high-temperature and low-temperature types. (2) The second category is multi-grade viscosity all-weather type: Oil grades include SAE5W-30, SAE15W-40, SAE20W-50. The first part before the hyphen in this grade indicates the oil's low-temperature viscosity performance in winter, and the second part after the hyphen indicates its high-temperature viscosity performance in summer.
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