Can the Subject 3 Exam Fee Be Refunded After Payment?

Must the Passat use 95-octane gasoline?

According to the official vehicle manual recommendation, the Passat should use 95-octane gasoline. If the Passat occasionally uses the wrong gasoline grade, simply switch back to the correct grade after consumption. However, prolonged use of the wrong gasoline grade may have the following effects: For vehicles recommended for lower octane, using higher octane gasoline will not cause damage, but the increase in octane rating may alter the fuel's ignition point, leading to delayed combustion in the engine. This results in reduced engine power and thermal efficiency, with the actual feedback being poorer performance. For vehicles recommended for higher octane, using lower octane gasoline may cause engine knocking. Due to the significantly lower octane rating, the gasoline's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance will arise during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without significant engine damage, but noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring. In addition to checking the recommended gasoline grade in the vehicle manual, the Passat's fuel filler cap also indicates the appropriate octane rating. Generally, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95-octane gasoline. However, with the application of new technologies, the compression ratio alone cannot determine the required gasoline grade. High compression ratio engines can still be tuned to use lower octane gasoline due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Generally, the higher the gasoline octane rating, the higher the octane number and the better the anti-knock performance. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane.

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Which Mercedes-Benz models are available in blue?

Mercedes-Benz offers two domestically produced blue sedan models: the A-Class and the C-Class. The domestically produced Mercedes-Benz models include both long-wheelbase and standard-wheelbase versions. The Mercedes-Benz C-Class is equipped with three types of engines: a low-power 1.5-liter turbocharged engine, a high-power 1.5-liter turbocharged engine, and a 2.0-liter turbocharged engine. The low-power 1.5-liter turbocharged engine has a maximum torque range of 1,500 to 4,000 rpm and a maximum power output at 5,700 rpm. This engine features direct fuel injection technology and uses an aluminum alloy cylinder head and block. The high-power 1.5-liter turbocharged engine delivers maximum power at 6,100 rpm and maximum torque between 3,000 and 4,000 rpm. It also employs direct fuel injection technology and an aluminum alloy cylinder head and block. The 2.0-liter turbocharged engine generates maximum torque between 1,800 and 4,000 rpm and reaches maximum power at 6,100 rpm. Like the others, it is equipped with direct fuel injection technology and uses an aluminum alloy cylinder head and block.

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What is the tire model and specification for the Mercedes-Benz E300L?

The tire size for the Mercedes-Benz E300L is 245/45R18. The first number, 245, represents the tire width of 245MM. The 45 indicates the tire's aspect ratio is 45, meaning the section height is 45% of the width. The 18 stands for the rim diameter of 18 inches, and the letter "R" in the middle denotes a radial tire. The Mercedes-Benz E300L uses Bridgestone's TURANZA run-flat tires, featuring a five-spoke hollow design. None of the models come with a spare tire as standard. If you want to change the tires yourself, you can follow these steps: Retrieve the spare tire and jack, place the jack under the frame of the tire you wish to change, ensuring the jack touches the metal part of the frame. Raise the jack until it supports the car. The jack should be positioned under the vehicle, and you should check to ensure the jack is at a right angle to the ground. Remove the hubcap and loosen the nuts counterclockwise. Do not fully remove the nuts; just loosen them enough to eliminate resistance. When loosening the nuts for the first time, keeping the tire on the ground ensures that the nuts turn, not the tire. Turn the nuts counterclockwise until they are loose. Repeat this step for all lug nuts and then completely remove them. Place the new tire on the wheel hub, carefully aligning the tire rim with the wheel bolts. Install the lug nuts and tighten them by hand until all nuts are concealed. At this point, the tire change is complete. In addition to the model, the tire also displays the following common data: Tire cord material: Indicated by Chinese pinyin, such as M for cotton cord, R for rayon cord, N for nylon cord, G for steel cord, and ZG for steel radial cord tires. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under specified conditions. Letters A to Z represent certified speed ratings from 4.8 km/h to 300 km/h. Common speed ratings include: Q: 160 km/h; H: 210 km/h; V: 240 km/h; W: 270 km/h; Y: 300 km/h. Rim specification: Indicates the rim specification compatible with the tire, facilitating practical use, such as "Standard Rim 5.00F".

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Should Automatic Headlights Be Turned Off After Engine Shutdown?

Automatic headlights should be turned off after engine shutdown because once the engine is turned off, the alternator stops working, and the only power source for the entire vehicle is the battery. If the headlights remain on for an extended period, it can easily lead to battery drain, affect engine startup, and shorten the battery's lifespan. Automatic headlights can be turned off by quickly pressing the lock button twice. The activation of automatic headlights has a delay—the headlights will only turn on automatically within a few seconds after the light sensor detects dimming conditions. According to traffic regulations, headlights must be turned on in advance before entering a tunnel, so manual activation is still required when driving through tunnels.

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What engine does the Venucia Star use?

Venucia Star is equipped with a Mitsubishi A415TD 1.5T turbocharged engine, which delivers a maximum power of 140 kW and a maximum horsepower of 190 hp, paired with a 7DCT transmission. The Venucia Star is an SUV model launched by Dongfeng Venucia, with dimensions of 4691 mm in length, 1905 mm in width, and 1706 mm in height, and a wheelbase of 2756 mm. The front grille of the Venucia Star features a distinctive dense dot-matrix design, with a particularly impressive V-shaped pattern. The center console of the new Venucia Star is high-end and futuristic, wrapped in large areas of leather material, exuding a very luxurious feel.

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What Causes Idle Vibration After an Oil Change?

The reasons for idle vibration after an oil change are as follows: 1. If the viscosity of the new engine oil is unsuitable for the vehicle, the fuel injectors may become clogged, leading to inconsistent fuel injection amounts from each injector. This results in uneven cylinder operation and causes engine vibration. The solution is to remove and clean them. 2. If the engine oil is not genuine or contains excessive impurities, it can lead to excessive carbon buildup. Over time, carbon deposits and oil sludge can clog the throttle body, idle valve, and intake ports, restricting airflow and affecting idle stability, causing vibration. These issues can be resolved by inspecting and cleaning the mentioned components with a cleaning agent without the need for removal.

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Can the Subject 3 Exam Fee Be Refunded After Payment?

Must the Passat use 95-octane gasoline?

Which Mercedes-Benz models are available in blue?

What is the tire model and specification for the Mercedes-Benz E300L?

Should Automatic Headlights Be Turned Off After Engine Shutdown?

What engine does the Venucia Star use?

What Causes Idle Vibration After an Oil Change?

What is the power output of the Porsche Panamera Hybrid?

What model is the Toyota Prado?

What Causes Radiator Leakage?

Which pure electric vehicles does Honda have?