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What do 'L' and 'H' on the car dashboard refer to?

1 Answers

MacEmerson

07/30/25 1:29am

On the car dashboard, 'L' and 'H' refer to the lower and upper limits of engine oil. Here are the specific details about engine oil: 1. Types of Engine Oil: Engine oil grades are divided into gasoline-type, diesel-type, and universal gasoline-diesel type: Those starting with the letter 'S' represent oils for gasoline engines, with specifications including API SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN; those starting with the letter 'C' represent oils for diesel engines, with specifications including API CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4. If both are present, such as SM/CF, it indicates that the oil is a universal gasoline-diesel type. 2. Meaning of the Letters: The further the letter after 'S' or 'C' is in the alphabet, the higher the quality grade of the oil, indicating more stable performance and a higher oil grade. Currently, the market also categorizes engine oils into three types: mineral oil, semi-synthetic oil, and synthetic oil. The corresponding oil grades are SA to SJ for mineral oil, SJ and SL for semi-synthetic oil, and SM and SN for fully synthetic oil. In addition to the oil grade identification, some oil packaging may have the SAE label. SAE stands for the Society of Automotive Engineers in the United States, which sets the standard viscosity values for engine oil, such as 5W-30.

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How Many Years Can a Car Be Driven?

Vehicles are categorized as follows based on their type: 1. Non-commercial passenger vehicles with fewer than 9 seats can be used for 15 years. If the vehicle meets the scrapping standards but the owner wishes to continue using it, no approval is required. After passing an inspection, the vehicle's service life can be extended. 2. Tourist passenger vehicles and non-commercial passenger vehicles with 9 or more seats can be used for 10 years. If the vehicle meets the scrapping standards but the owner wishes to continue using it, the current regulations and procedures apply, and the service life can be extended for up to 10 years. 3. Tourist passenger vehicles with extended service life must undergo 4 annual inspections, while non-commercial passenger vehicles with 9 or more seats and extended service life must undergo 2 annual inspections. For vehicles older than 15 years, starting from the 16th year, 4 annual inspections are required. 4. The service life of commercial buses is adjusted to 10 years. If the vehicle meets the scrapping standards but the owner wishes to continue using it, the current regulations and procedures apply, and the service life can be extended for up to 4 years, with 4 annual inspections required during the extended period.

What documents are required for registering a new car?

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What materials are needed for assessing the loss of operating vehicle suspension?

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Why does an automatic transmission car's engine speed increase but the speed doesn't when accelerating?

When an automatic transmission car's engine speed increases but the speed doesn't when accelerating, it is typically an issue with the automatic transmission, with the most common cause being the torque converter not locking up. Symptoms of a torque converter not locking up: Under normal circumstances, when the engine speed, vehicle speed, and throttle depth reach a certain level, the torque converter should lock up. If the torque converter fails to lock up, it often results in the car revving loudly without accelerating. This phenomenon mainly occurs in vehicles equipped with torque converters, such as all AT (automatic transmission) cars and some CVT (continuously variable transmission) models. Solution: For smooth and powerful acceleration in an automatic transmission car, it is necessary to press the accelerator pedal more firmly. Whether the torque converter locks up depends not only on the vehicle speed but also on the engine speed and throttle depth. If the driver consistently applies light throttle input and maintains low speeds, the engine speed may not rise sufficiently, preventing the torque converter from locking up.

Are There Any China V Motorcycles?

Not yet. China IV motorcycles have just been launched, and they are not yet widespread. China V will have to wait for several more years. China V will be implemented in a few years: As environmental standards become increasingly higher and stricter, motorcycles will definitely adopt the China V standard in the future. However, at present, the China IV standard has only just begun to be fully implemented. The China V standard will likely take at least a few more years before it is implemented, and there is no specific date yet. China V standard is equivalent to the Euro V standard in the EU: The EU has been implementing this standard since 2009, which imposes stricter limits on pollutants such as nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter from motor vehicles. Each upgrade in standards reduces vehicle pollution by 30% to 50%. As of January 2013, the China V standard was still in the public consultation phase. Research results show that upgrading the quality of automotive gasoline and diesel contributes significantly to emission reductions. Replacing China IV gasoline and diesel with China V will achieve at least a 10% and 7% reduction in nitrogen oxide emissions, respectively.

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