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What are the symptoms of using low-quality engine oil?

1 Answers

ReeseAnn

07/29/25 9:56am

Using low-quality engine oil can make the car noticeably sluggish. Here are detailed explanations about engine oil: 1. Methods to determine oil quality: Check the packaging of the engine oil. Reputable brands use one-time-use caps, and the foil seal usually bears the manufacturer's special mark. If you don't see such a mark, be cautious. Smell the oil - engine oil is typically a blend of base oil and additives, while synthetic oil contains various additives. 2. Introduction to oil quality: If the oil remains yellow after some use, it indicates good detergent dispersancy and oxidation resistance. However, if it's still yellow at the scheduled oil change interval, this is abnormal - you should check whether coolant has leaked into the oil. The color of drained oil cannot serve as a standard for judging oil quality, so there's no saying whether yellow or black drained oil is better.

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Can I go directly to take the Subject 4 exam?

Yes, because Subject 4 is an assessment of civilized driving conducted by the traffic management department before issuing the license, which is considered a personal action, so you can go by yourself. Additional information: Subject 4: Also known as the Subject 4 theory test or driver theory test, it is part of the motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security's Order No. 123, the Subject 3 exam was divided into two parts: the road test and the addition of a safe and civilized driving test, commonly referred to as "Subject 4," which evaluates "driving ethics." If you fail Subject 4, you do not need to retake the previously passed exams (Subject 1, Subject 2, Subject 3). The driving school will schedule a retest for you, with no limit on the number of retakes. You can retake the exam until you pass, but generally, a retest fee is required for each attempt.

How many seconds after the light turns red does the camera start capturing?

After 3 seconds, the camera will start capturing vehicles running red lights. Here is the relevant information: Red light running capture: When the red light is on, the induction line senses the pressure from vehicles on the road and uses sensors to transmit the signal to the central processor, which is temporarily stored in the register. The moment the red light turns on, if two signals are successfully sent, it is considered running a red light. Working principle: When the red light is on, if the front wheels of the vehicle cross the line but the rear wheels are still within the line, only one signal is generated, and the chance of being captured is low. However, if the front wheels cross the line and the vehicle reverses back within the line to avoid being captured, the camera may sense it and send another signal. Two signals will then be judged as running a red light.

Do Hybrid Cars Need Separate Charging?

There are two types of hybrid vehicles. Standard hybrid: can charge the battery while driving. Plug-in hybrid: consumes battery power and generally does not charge. Taking Toyota's Leiling Dual Engine hybrid as an example, during the car's coasting phase, the drive motor converts into a generator, transforming kinetic energy into electrical energy to charge the car's battery. Here is additional information: Plug-in hybrid: For plug-in hybrids, such as the Changan Ford Mondeo 2018 plug-in hybrid, since the drive motor does not have the capability to charge the battery, the battery's power is always in a state of consumption without replenishment. Therefore, it almost always requires charging before each trip.

Can You Wear a Skirt for Subject Two Driving Test?

In general, it is not recommended to wear a long skirt while driving, as it may easily get caught on the clutch or brake pedals, posing safety hazards. Here is some relevant information: Suggestion: It is advisable to wear cloth shoes or flat shoes, as they provide better foot control over the accelerator, brake, and clutch, making it easier to master the "key points" of those pedals. Precautions for Subject Two Test: Wearing slippers, high heels, or colored sunglasses is not allowed. There is no explicit rule against wearing skirts, but for safety reasons, it is not recommended to wear long skirts during the test. Just dress as you normally would for practice sessions and approach the test with the same mindset as during practice—don't be too nervous.

What is the Difference Between Dry and Wet Dual-Clutch Transmissions?

Dry and wet dual-clutch transmissions differ in the following aspects: 1. Heat dissipation: Dry dual-clutch transmissions rely on air cooling for heat dissipation, while wet dual-clutch transmissions are immersed in oil, resulting in higher cooling efficiency. 2. Operation method: Dry clutches are manual transmission friction plate clutches with high mechanical transmission efficiency, more complex operation, and higher failure rates. Wet clutches are automatic transmission oil-immersed friction plate clutches with lower mechanical transmission efficiency, easier operation, and lower failure rates. Dual-clutch transmissions are not suitable for frequent starts, prolonged low-speed driving, or stop-and-go traffic, as they are prone to overheating, which can lead to malfunctions. Once the vehicle's computer issues a warning, it is essential to stop immediately and cool down the transmission.

Does Car Polishing Affect the Car Paint?

Car polishing does have an impact on the car paint, but it is minimal. Car polishing is a step in the car beautification process, performed before waxing, sealing, or coating to prepare the car's surface. It is essential to have polishing done at a professional beauty shop to ensure the quality of the polishing wax and minimize potential damage, as professional technicians can operate with precision. The coarseness of the polishing wax used depends on the level of oxidation of the car paint. After polishing and applying a mirror glaze treatment, the car paint must be coated with a layer of wax to complete the final protection, achieving the best possible protection for the car. Since the car paint is constantly exposed to external elements such as UV rays, rain, tree branches, and stones, which can cause damage, maintaining the overall beauty of the car requires regular waxing for protection.

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