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What are the reasons for changing engine oil in a vehicle?

2 Answers

DelKylie

08/31/25 8:41am

Vehicle engine oil needs to be changed to ensure its proper functioning and effective protection of the engine. The roles of engine oil are: 1. Lubrication to reduce wear - Between the engine's pistons and cylinders, as well as between the crankshaft and bearings, relative sliding causes wear. Engine oil forms a thick oil film between these sliding surfaces, separating the moving parts to minimize wear; 2. Cooling - The oil carries heat back to the oil pan where it dissipates into the air, assisting the radiator in cooling the engine; 3. Cleaning - Engine oil circulates carbon deposits, sludge, and worn metal particles from engine components back to the oil pan, flushing away contaminants through the flow of lubricant; 4. Shock absorption - When pressure rises in the engine cylinder, suddenly increasing the load on pistons, piston rings, connecting rods, and crankshaft bearings, the lubricated bearing transmission helps cushion these impact loads.

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Graham

09/13/25 4:49am

My experience driving various models has taught me the critical importance of regular oil changes. It lubricates the moving parts inside the engine, such as pistons and crankshafts, reducing friction and wear; if the oil becomes old, its lubricating effectiveness diminishes significantly, making the engine prone to overheating or even damage. Through long-term vehicle use, I've realized that oil also helps remove carbon deposits and impurities, prevents corrosion, and safeguards the engine's overall health. Neglecting timely oil changes can lead to increased fuel consumption, affecting economy, or worse, necessitate costly major repairs. I typically change the oil every 5,000 kilometers or every six months, adjusting based on road conditions; synthetic oil offers longer-lasting protection. Ensuring you check the oil level and condition during changes can provide peace of mind for long-distance drives. Regular maintenance is like giving your car a blood transfusion, extending engine life and ultimately reducing maintenance costs.

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Differences Between LNG and CNG

Differences between LNG and CNG: 1. Similarities and Differences: Both are natural gas with the same composition, differing only in their states of existence. 2. Meaning of CNG: CNG stands for Compressed Natural Gas, which is natural gas pressurized (over 3,600 pounds per square inch) and stored in containers in a gaseous state. 3. Meaning of LNG: LNG stands for Liquefied Natural Gas. LNG is produced by cooling gaseous natural gas at atmospheric pressure to -162°C, causing it to condense into a liquid. 4. Storage State and Containers: The storage states and containers differ. CNG is stored as a high-pressure gas in pressure vessels, typically at 20MPa, while LNG is stored in a cryogenic state in pressure vessels, usually at -160°C. The amount stored in pressure vessels of the same water volume differs under standard conditions.

What are the standard dimensions of a sedan?

The standard dimensions of a sedan are categorized into several levels. For household sedans, the length typically ranges between 3800mm and 4300mm, the width between 1600mm and 1800mm, and the height between 1400mm and 1600mm. Below is a detailed introduction: Length: Length is the most influential parameter affecting the car's purpose, functionality, and ease of use. Therefore, vehicle classes are generally divided based on length. A longer body means more longitudinal usable space, which is obvious; however, an excessively long body can make turning and parking inconvenient. There is a significant difference in driving feel between a 4-meter-long car and a 5-meter-long one. Generally, small and medium-sized passenger cars are about 4 meters long, while those approaching 5 meters can be considered large cars. Width: Width mainly affects seating space and flexibility. For passenger sedans, if three seats are to be arranged side by side with a spacious feel (primarily sufficient shoulder room), the width should generally reach 1.8M. In recent years, due to increased safety requirements, the thickness of door panels has increased, leading to a general increase in vehicle width. Height: Vehicle height directly impacts the center of gravity (handling) and space. Most sedans are under 1.5 meters tall, significantly lower than the natural sitting height of a human body, mainly to lower the vehicle's center of gravity and ensure stability during high-speed turns. MPVs and minivans, designed to provide ample headroom and cargo space, are generally taller (over 1.6 meters), but this raises the vehicle's center of gravity, resulting in larger body roll angles during turns—a significant drawback of taller vehicles. Wheelbase: Once the vehicle length is determined, the wheelbase becomes the most critical factor affecting seating space, as the majority of two-box and three-box sedans position passenger seats between the front and rear axles. A longer wheelbase increases longitudinal space for passengers, directly benefiting legroom, which greatly impacts comfort. In terms of driving performance, a longer wheelbase enhances straight-line cruising stability but reduces turning agility and increases the turning radius. Therefore, a balance must be struck between stability and agility.

How to Calculate the Purchase Tax for Sedans?

The calculation formula for sedan purchase tax is: Purchase Tax = Taxable Price × Tax Rate. Here is some information about vehicle purchase tax: 1. Implementation Date: The basic regulations of the current vehicle purchase tax law were implemented on January 1, 2001, under the "Interim Regulations of the People's Republic of China on Vehicle Purchase Tax." 2. Introduction: The taxpayers of vehicle purchase tax are units and individuals who purchase (including buying, importing, self-producing, receiving as gifts, winning as prizes, or obtaining through other means and using for personal use) taxable vehicles. The tax scope includes cars, motorcycles, electric vehicles, trailers, and agricultural transport vehicles, with a tax rate of 10%.

Can the license plate be retained when selling a car?

Selling a car can retain the license plate. The required documents include: 1. ID card and its copy. 2. "Motor Vehicle Transfer or Registration Application Form". 3. Proof of compulsory traffic insurance. 4. Annual inspection certificate. 5. Whole vehicle factory certificate. 6. Proof of motor vehicle origin. 7. For imported vehicles, import certificates, proof of purchase tax payment, and various documents submitted during vehicle registration are required. The conditions for retaining the original license plate after selling the car are as follows: 1. The vehicle must have been used for at least one year to retain the original license plate, and the retention period can be up to one year. 2. The original license plate can be retained in case of vehicle transfer, cancellation, or relocation. 3. Both purchasing a used car and a new car can apply for retention. 4. All traffic violation records of the original vehicle must be settled.

Where are the 8 airbags in the new Levin located?

The 8 airbags in the new Levin are distributed as follows: two in front of the driver and front passenger, two on the side of the legs, two on the side of the front seats, and two on each side of the rear seat windows. Here is some related information about car airbags: 1. Types of car airbags: Classified by quantity, there are single airbags, dual airbags, four airbags, and multi-airbag systems; classified by protection objects, they can be divided into front airbags, passenger airbags, side airbags, rear side airbags, side curtain airbags, and knee airbags. 2. Configuration of car airbags: Depending on the model and vehicle configuration, most cars are equipped with at least 1-2 airbags, while higher-end luxury cars generally have multiple airbags.

Can I still drive if my motor vehicle has been deducted 12 points?

Deducted 12 points cannot drive. The reason is that if you are deducted 12 points, your driver's license will be revoked. If you are caught driving on the road, your vehicle will be detained, and the traffic management department of the public security organ will impose a fine of not less than 200 yuan but not more than 2,000 yuan, and may also impose a detention of not more than 15 days. The following is the extended information: 1. Deducted 12 points at one time: If you are deducted 12 points in a scoring cycle (12 months), the driver must participate in the study of road traffic safety laws, regulations, and related knowledge within 15 days of receiving the notice, and take the subject one test within 20 days after completing the study. If the subject one test is passed, the points will be cleared, and the motor vehicle driver's license will be returned; if the test is failed, the driver will need to continue to participate in the study and test. 2. Deducted 12 points twice: If you are deducted 12 points twice in a scoring cycle (12 months), the driver will need to take the subject one test and also participate in the subject three test (road test).

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