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What is the classification of diesel engine oil grades?

1 Answers
Martha
07/30/25 1:54am
Diesel engine oil grades are classified as: CA, CB, CC, CD, CE, CF, CF4, CG4, CH4, CI4, CJ4. The further the letter is in the alphabet, the higher the oil quality grade. Currently, CF4 is the main diesel engine oil grade used in China. CF4 is used for high-speed direct injection diesel engines, suitable for diesel with high sulfur content, and particularly suitable for heavy-duty trucks. Diesel engines are divided into: 1. Spark-ignition engines: Gasoline engines inject gasoline into the intake pipe, where it mixes with air to form a combustible mixture before entering the cylinder, which is then ignited by a spark plug to burn and expand, performing work; 2. Compression-ignition engines: Diesel engines directly inject diesel into the engine cylinder through a fuel injection pump and nozzle, where it mixes uniformly with the compressed air in the cylinder and self-ignites under high temperature and pressure, pushing the piston to perform work.
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Are Car Headlight Brighteners Useful?

Car headlight brighteners are useful. Below is an introduction to the functions and potential hazards of brighteners: 1. They can improve the lighting of older vehicles by up to thirty percent. However, increasing the bulb's power also means higher electricity consumption. The increased current may cause the wiring to heat up, leading to higher resistance. The messy wiring after modification is prone to wear and grounding, which can result in burned wiring at best or vehicle self-ignition at worst. 2. Additionally, this will definitely affect the lifespan of the car bulbs. 3. A headlight brightener is not actually a device that increases brightness but rather a power line. It changes the original headlight wiring from the generator to a direct connection to the battery, ensuring the stability of the headlight's brightness. The brightener consists of two relays.
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How long is the Maybach 62s body?

The Maybach 62s has a length of 6165 millimeters and a wheelbase of 3827 millimeters. The Maybach 62s is a large luxury sedan from the German automobile manufacturer Maybach, whose vehicles are all ultra-luxury cars. Here is some information about the Maybach 62s: 1. The Maybach 62s engine has 612 horsepower and a maximum torque of 1000 Newton-meters. This engine can deliver maximum power at 4800 to 5100 revolutions per minute and maximum torque at 2000 to 4000 revolutions per minute. 2. The Maybach 62s engine is equipped with multi-point fuel injection technology and uses an aluminum alloy cylinder head and block. It is paired with a 5-speed automatic transmission. 3. The Maybach 62s uses an active air suspension for both the front and rear suspension.
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What are the reasons for parking brake failure?

Here are the reasons for parking brake failure: 1. Excessive clearance between friction pads and brake drum, oil contamination on friction pads or brake drum, severe wear of friction pads, exposed rivets, or surface hardening causing slippage. 2. Severe wear of parking brake pin shaft, excessive clearance, or over-adjusted parking brake lever. Additional information: 1. The parking function refers to when the engine is running or the vehicle is in motion, the parking brake is implemented through the DSC hydraulic system acting on the front and rear axle disc brakes. 2. When the engine is off and the vehicle is stationary, the parking brake operates via an electromechanical servo unit that manipulates the cables acting on the dual self-energizing drum brakes on the rear axle.
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Where is the radiator located in Hyundai Verna?

Hyundai Verna's radiator is located in the engine compartment, behind the grille, connected to the coolant. The car radiator generally refers to the heat exchanger. The heat exchanger is part of the car's cooling system. The radiator in the engine water cooling system consists of three parts: the inlet chamber, the outlet chamber, the main plate, and the radiator core. Below are some maintenance methods for the car radiator: 1. Park the vehicle and turn off the engine. Wait for the coolant temperature to drop, then open the expansion tank and add radiator cleaner. 2. Start the engine and let it idle for 5-10 minutes after the cooling fan starts working. 3. Turn off the engine and remove the front bumper. Ensure all fixing screws are loosened during removal, and slowly detach from both ends towards the middle. Be careful not to break the fixing clips. 4. After ensuring the coolant temperature has completely cooled, drain the radiator cleaner along with the coolant, and finally replace it with new engine coolant.
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How to Drive on a Reversible Lane?

Here is the correct way to drive on a reversible lane: 1. Before entering the reversible lane, check if the signal light turns green. Only when it turns green can you enter the reversible lane and wait to make a left turn. Do not enter the reversible lane when the red light is on. 2. Do not cross the lane markings or change lanes directly while driving on the reversible lane. Wait patiently for the signal light to turn green before using the reversible lane to make a left turn. 3. Pay attention to the instructions on the signs. Generally, reversible lanes have time restrictions, such as being available during morning and evening rush hours but not at other times. 4. If the traffic volume on the reversible lane becomes too heavy or no longer suits the intersection's traffic flow, follow the on-site instructions of traffic police and avoid using the reversible lane arbitrarily. 5. Be especially cautious when passing through a reversible lane for straight-through traffic. Check the signal light before using the reversible lane to avoid running a red light. 6. When encountering a reversible lane, yield to vehicles making U-turns, as the left-turn entrance of the reversible lane often intersects with the U-turn location. Be sure to yield in time.
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What should be paid attention to when buying a used car?

Here are the precautions when buying a used car: 1. Pay attention to the appearance: Observe the appearance carefully, check if there is any paintwork on various corners and parts of the car, and whether there are signs of wear on the tires, headlights, or bumpers. 2. Pay attention to the chassis and frame: If deformation or bending is found, the car may have been in an accident. 3. Pay attention to the car's performance: Tap the body to listen if the sound is normal, and start the car to listen if the engine sound is normal. 4. Complete documentation: Generally includes: registration certificate, driving license, purchase tax, compulsory traffic insurance, proving that the car's paperwork is complete and it is not a problematic vehicle.
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