What does the driving test subject 4 cover?

What oil should be used for squeaky door hinges?

Engine oil or edible oil can be used for squeaky door hinges. The following are the reasons for the noise: 1. Uneven contact surfaces: Normally, door hinges should rotate smoothly and freely when opening and closing the door. However, if the contact surfaces between the rotating parts are uneven, it will produce noise. 2. Lack of lubrication: If the door hinges lack lubrication, metal rubbing against metal will create noise. Apply engine oil or edible oil to each hinge of the door, then open and close the door several times to eliminate the noise. Precautions for opening and closing doors: 1. Pay attention to the force when closing the door: When opening and closing the door, be gentle and avoid using excessive force to prevent damage to the hinges. 2. Prevent water from splashing onto the door: Avoid excessive water exposure to the door. When water gets on the door, it may cause the door to sag slightly due to gravity, increasing friction with the ground and misalignment with the door frame. Additionally, water exposure can cause the hinges to rust, further increasing friction noise.

15

1

Share

What is the fuel tank capacity of the Dongfeng Fengguang 580?

Dongfeng Fengguang 580 has a fuel tank capacity of 58L. The fuel tank capacity measures a vehicle's ability to carry fuel, which determines the driving range. For two cars with identical engines, the one with a larger fuel tank can travel farther. The Dongfeng Fengguang 580 is an SUV under the Dongfeng brand, with dimensions of 4690mm in length, 1845mm in width, and 1715mm in height, and a wheelbase of 2780mm. In terms of intelligent features, the Dongfeng Fengguang 580 Zhishang Edition is equipped with engine start-stop technology to reduce idling consumption, automatic headlights, wipers, air conditioning, and a 360-degree panoramic parking system with a sensor-activated electric tailgate.

5

3

Share

What Causes a Car to Emit Blue Smoke?

Car emitting blue smoke is caused by incorrect engine oil viscosity selection, piston ring carbon buildup, aging valve stem seals, and other reasons. The specific causes are as follows: Incorrect Engine Oil Selection: Manifested as no blue smoke during cold starts in the morning, but a small amount of blue smoke is emitted after the engine warms up. There was no blue smoke before, but it appears after switching to another type of engine oil. The car accelerates normally, but engine oil consumption is excessive, and engine noise increases. Piston Ring Carbon Buildup: Carbon deposits on the piston rings cause them to lose tension and fail to seal properly, allowing engine oil to enter the combustion chamber through the gaps. Engine power decreases, cylinder compression performance declines, and engine oil consumption relatively increases. Aging Valve Stem Seals: Hardened valve stem seals cannot expand and contract with the temperature changes of the valves, causing engine oil to enter the combustion chamber from the seals during cold starts. A stuck PCV valve allows combustible mixture to enter the crankcase, thinning and contaminating the engine oil, which then enters the combustion chamber and accelerates oil consumption.

15

0

Share

How to Turn on the Heater in the Tiguan L?

The method to turn on the heater in the Tiguan L: 1. Press the one-touch start button in the vehicle to start the engine; 2. Locate the air conditioning switch in the vehicle's cockpit area; 3. Press the button on the air conditioning panel to turn on the air conditioning; 4. Press the AC button to turn off the air conditioning cooling function, which will activate the heater. The Tiguan L is produced by SAIC Volkswagen. The vehicle measures 4712 mm in length, 1839 mm in width, and 1673 mm in height, with a wheelbase of 2791 mm. In terms of safety features, the new Tiguan L comes standard with ESP vehicle stability system and front side airbags. The top-of-the-line flagship model is equipped with a pre-collision safety protection system, knee airbags, lane keeping system, 360-degree parking camera, and HUD head-up display system.

1

Share

What does SN grade engine oil mean?

SN grade engine oil is currently the highest classification for gasoline engine oils under the API (American Petroleum Institute) system. Engine oils starting with "S" are specifically designed for gasoline engines and cannot be used in diesel vehicles. Below is some relevant information: 1. Engine oil grade classification: API (American Petroleum Institute) is the abbreviation for the American Petroleum Institute. API grades represent the quality classification of engine oils. It uses simple codes to describe the performance capability of engine oils. The grades are classified as SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN, with the letters further in the alphabet indicating higher grades. SN is currently the highest grade of engine oil. 2. Engine oil quality classification: SN grade engine oil, being the highest grade, generally falls under the category of full synthetic oils. Semi-synthetic oils are mostly classified as SL or SM grades, though some may also be SN grade. Among international brands, engine oils are typically SF grade or higher. For example, Shell Helix Ultra is SM grade, while Shell Helix Red is SG grade, indicating that Helix Ultra has a higher quality grade than Helix Red.

2

1

Share

What do V and W mean on tires?

The V and W markings on tires indicate the tire's certified speed rating, which represents the maximum permissible speed for the tire. W stands for a maximum speed of 270 km/h, V for 240 km/h, H for 210 km/h, and Y for 300 km/h. Below is a detailed explanation: 1. Tire maximum speed: The maximum speed of a tire refers to the highest speed it can safely handle. When using the tire, the driving speed must not exceed this maximum speed. Exceeding the tire's maximum speed rating can lead to inadequate heat dissipation, increasing the risk of a blowout, and the tire may not maintain normal performance at such speeds. 2. Classification of tire speed ratings: Generally, the further the letter representing the tire speed rating is in the alphabet, the better the tire's performance and the higher its price. Tires with different speed ratings are suitable for different types of vehicles. P—T rated tires (maximum speed 150—190 km/h) are suitable for small and compact cars, U—V rated tires (maximum speed 200—240 km/h) are for mid-to-high-end sedans, and the highest-performing W—Z tires, which can handle speeds between 240—300 km/h, are typically used in large luxury cars and supercars.

5

4

Share

What does the driving test subject 4 cover?

What oil should be used for squeaky door hinges?

What is the fuel tank capacity of the Dongfeng Fengguang 580?

What Causes a Car to Emit Blue Smoke?

How to Turn on the Heater in the Tiguan L?

What does SN grade engine oil mean?

What do V and W mean on tires?

What are the differences between two-wheel drive and four-wheel drive vehicles?

Which oxygen sensor is faulty when P0420 code appears?

What does HDC system failure refer to?

What Causes Vehicle Shaking?