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How to Determine When Engine Oil Needs to Be Changed?

1 Answers
NathanAnn
07/30/25 2:55am
Pull out the dipstick, then drip the oil from the dipstick onto a tissue paper to observe the color and viscosity of the oil. If the color appears quite black, it should be changed. Below are specific details about engine oil: 1. Generally, fully synthetic oil needs to be changed every eight thousand to ten thousand kilometers. 2. Engine oil is referred to as the lifeblood of the engine. Inside the engine, oil not only lubricates but also cleans, seals, buffers, prevents rust, and dissipates heat. Without oil, the engine cannot operate. During engine operation, the oil forms a thin film on the surfaces of various components inside the engine, preventing direct contact and friction between them.
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More Forum Discussions

What is the Difference Between Parking Radar and Rearview Camera?

The differences between parking radar and rearview camera are: 1. Different components: The parking radar consists of a front controller, sensors, and an indicator; the rearview camera consists of ultrasonic sensors, a controller, a display, and a buzzer. 2. Different functions: The parking radar is used to detect the distance, direction, and area information of obstacles around the car; the rearview camera can inform the driver about surrounding obstacles through sound and more intuitive visual images. The parking radar is a safety assistance device used when reversing or parking, divided into front radar and rear radar. The front radar probe is installed on the front bumper, radiating at approximately a 45-degree angle, capable of detecting obstacles below the bumper and issuing an alert. The rearview camera is installed at the rear of the vehicle, providing a clear view of obstacles behind.
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What is the speed limit for the leftmost lane in a two-lane road?

On a two-lane highway in the same direction, the speed limit for the left high-speed lane is 100-120 km/h, while the right lane has a speed limit of 60-100 km/h. For small passenger vehicles, the maximum speed should not exceed 120 km/h, and for other motor vehicles, the maximum speed should not exceed 100 km/h. Three-lane speed limits: On a three-lane highway in the same direction, the leftmost lane is the overtaking lane with a speed limit of 110-120 km/h. The middle and rightmost lanes are driving lanes with speed limits of 90-110 km/h and 60-90 km/h respectively. Precautions for driving on highways: When merging, do not obstruct vehicles already traveling in the main lane; while driving, always pay attention to roadside and road signs and markings, and drive appropriately to the right, avoiding straddling lanes; maintain a safe longitudinal distance between vehicles, increasing the distance in special weather conditions; when overtaking, estimate the distance and speeds of both vehicles accurately. Under normal circumstances, signal with the left turn indicator, sound the horn, and overtake from the overtaking lane. Overtaking from the right is prohibited. Speed limits during special periods: When driving on ordinary roads in fog, rain, snow, sandstorms, or hail with visibility less than 50 meters, or on icy or muddy roads, the speed limit is 30 km/h.
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What does inline 4-cylinder mean?

Inline 4-cylinder refers to an internal combustion engine configuration where four cylinders are arranged in a straight line. It is one of the cylinder arrangement types for internal combustion engines, commonly used in four-cylinder engines with displacements below 2.0 liters. The inline 4-cylinder design features a simple cylinder block and crankshaft structure, lower manufacturing costs, compact dimensions, high engine stability, good low-speed torque characteristics, and relatively low fuel consumption. Engine cylinder arrangements are categorized into: single-row, double-row, and triple-row configurations. In a single-row engine, all cylinders are aligned in one row, with possible cylinder orientations including vertical, inclined, or horizontal layouts. Examples of engines using the inline 4-cylinder configuration include: Ford Model T engine, Austin A-series engine, Honda ED-type engine, and Hyundai Alpha engine.
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What Causes Ignition Delay?

Delayed ignition in cars is caused by poor fuel quality, carbon buildup, or dirty components. Poor fuel quality: If your car suddenly changes from starting normally to having delayed ignition, the first thing to consider is whether you've recently switched to gasoline with a different octane rating or from a different source. Carbon buildup or dirty components: Carbon deposits on the throttle body can affect the sensitivity of the throttle and air intake, causing delays or errors in the computer's signal transmission, which may prevent the vehicle from starting. The fuel injector nozzle is prone to accumulating sticky deposits that can obstruct normal fuel injection, leading to poor gasoline atomization. This results in ignition delay and makes the car difficult to start.
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What are the symptoms of excessive refrigerant in car air conditioning?

The symptoms of excessive refrigerant in car air conditioning are: 1. The suction and discharge pressures of the air conditioning system are too high, and the operating temperature of the equipment is elevated; 2. The current value of the compressor power supply is significantly higher than normal, and prolonged operation may burn out electrical components; 3. The condenser is filled with refrigerant, reducing the heat exchange area, and high-pressure protection may occur after the car air conditioning is turned on. Car air conditioning is designed to regulate and control the temperature, humidity, and air cleanliness within the enclosed space of a vehicle. The function of the air conditioning refrigerant is to lower the temperature of the air inside the car. The refrigerant absorbs heat from the cooling medium in the evaporator and transfers the heat to the surrounding air or water in the condenser for condensation.
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How to Determine the Size of a Car's Fuel Tank?

Methods to determine the size of a car's fuel tank are: 1. Check the vehicle's manual; 2. Observe the fuel gauge. The impacts of overfilling the fuel tank include: 1. Spillage due to overfilling can lead to instant combustion if exposed to an open flame; 2. Blocking the vent hole creates negative pressure in the tank, causing poor fuel supply; 3. Gasoline entering the pipelines can cause spark plug failure, preventing the vehicle from starting; 4. Gasoline contains benzene, a carcinogen, and its volatilization can harm human health. Precautions for refueling: 1. Refuel in the morning or evening to avoid direct sunlight at noon; 2. Add more fresh fuel before long-distance trips; 3. Do not exceed the fuel tank's upper limit.
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