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Is Transmission Fluid the Same as Gear Oil?

1 Answers
VanRiver
07/29/25 2:41pm
Transmission fluid and gear oil are not the same. They differ in viscosity and properties, and must be used correctly without confusion. The specific details are as follows: Transmission fluid, also known as Automatic Transmission Fluid (ATF) or automatic transmission oil, is used as a working medium in vehicle automatic transmissions composed of hydraulic torque converters, hydraulic couplings, and mechanical transmissions. It transmits energy through the kinetic energy of the liquid. Gear oil is primarily made from petroleum-based lubricating oil or synthetic lubricating oil, blended with extreme pressure anti-wear agents and oiliness agents to form an important lubricating oil. It is used in various gear transmission devices to prevent tooth surface wear, scuffing, sintering, etc., thereby extending their service life and improving power transmission efficiency. Gear oil should have excellent anti-wear and load-bearing properties, as well as appropriate viscosity. Additionally, it should possess good thermal oxidation stability, anti-foaming properties, water separation performance, and rust prevention. Since gear loads generally exceed 490 MPa, and hypoid gear surface loads can reach up to 2942 MPa, extreme pressure anti-wear agents are often added to gear oil to prevent oil film rupture and subsequent tooth surface wear and scuffing. Sulfur-phosphorus or sulfur-phosphorus-nitrogen additives are commonly used. Transmission fluid cannot replace gear oil. Due to its low viscosity and the addition of large amounts of high-boiling-point organic solvents, it cannot be used as a substitute for mechanical lubrication oil.
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What Causes the Engine Malfunction Light to Illuminate in Yellow?

Engine malfunction lights come in two colors: yellow and red. Yellow indicates a warning, while red signifies a prohibition. When the yellow malfunction light is on, it means that certain system parameters in the vehicle may have exceeded the set range. The vehicle can still be driven, but some functions may be limited. When the red malfunction light is on, the vehicle must be stopped immediately, the engine must be turned off, and driving must be prohibited. The issue must then be checked. Generally, common causes for the engine malfunction light to illuminate include: sensor failure, oil quality issues, poor mixture combustion, turbocharging problems, intake issues, exhaust problems, and anti-theft system malfunctions. If the engine malfunction light comes on, follow these steps: After the engine malfunction light illuminates, first check if the engine is running normally. Look for issues such as shaking, black smoke, or difficulty starting. If any of these are present, avoid restarting the engine. Note: if the red light is on, do not restart the engine under any circumstances. If the engine is running normally and the vehicle can be driven, proceed to a service station as soon as possible to diagnose the issue. Service stations can easily read the fault codes using a portable diagnostic tool to obtain targeted repair information. If the engine is running normally, the owner can also try gently reconnecting various wiring harness connectors, as a loose connection may be the cause. Alternatively, repeatedly turning the key to the ON position may help reset the light.
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What are the reasons for a single-cylinder diesel engine emitting white smoke and failing to start?

Single-cylinder diesel engine emitting white smoke and failing to start reasons are as follows: Engine temperature too low: Some diesel fuel turns into vapor without burning and is discharged with the exhaust gas from the exhaust pipe, emitting white smoke; Water in fuel supply: There is moisture in the fuel or combustion chamber, which is heated into steam by the heat released during combustion in the cylinder and discharged from the exhaust pipe, forming white smoke; Injection timing too late: Due to late injection timing, the cylinder temperature has already dropped when fuel is injected, causing some diesel fuel to turn into vapor without burning, emitting white smoke; Poor fuel injector atomization: Poor atomization leads to incomplete combustion of diesel fuel, which mixes with the high-temperature exhaust gas from normally operating cylinders in the exhaust pipe, resulting in white smoke; Cylinder pressure too low: Some diesel fuel turns into vapor without burning, thus emitting white smoke from the exhaust pipe.
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How Many Kilometers Should a Volvo Timing Belt Be Replaced?

Volvo timing belts should be replaced between 90,000 to 100,000 kilometers, but the exact replacement interval depends on the actual usage of the vehicle. The functions of the timing belt are: 1. To drive the engine's valve train; 2. To ensure the engine's intake and exhaust valves open and close at the correct times; 3. To guarantee normal air intake and exhaust for the engine cylinders. The steps to replace the timing belt are: 1. Lift the vehicle and remove the right front wheel fender liner; 2. Remove the alternator belt and alternator belt tensioner; 3. Loosen the crankshaft pulley bolt; 4. Open the engine hood and remove the coolant reservoir; 5. Remove the engine mounting bracket and the protective cover on the timing belt; 6. Unscrew the alternator mounting bolt and remove the alternator; 7. Remove the engine block mounting bracket and take off the crankshaft pulley; 8. Rotate the crankshaft to the top dead center position of the cylinder and mark it; 9. Remove the timing belt and timing tensioner to complete the replacement.
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How Many Meters Away Should the Highway Warning Sign Be Set Up?

When a motor vehicle breaks down on the highway, the warning sign should be placed at least 150 meters away in the direction from which the vehicle is approaching. According to the "Road Traffic Safety Law of the People's Republic of China": Article 68: If a motor vehicle breaks down on the highway, the relevant provisions of Article 52 of this Law shall apply; however, the warning sign shall be placed at least 150 meters away in the direction from which the vehicle is approaching. The occupants of the vehicle shall quickly move to the right shoulder or the emergency lane and promptly call the police. Article 52: When a motor vehicle breaks down on the road and needs to be stopped to fix the problem, the driver shall immediately turn on the hazard warning lights and move the vehicle to a place where it does not obstruct traffic. If the vehicle is difficult to move, the hazard warning lights shall remain on, and measures such as setting up a warning sign in the direction from which the vehicle is approaching shall be taken to increase the warning distance. If necessary, the police shall be promptly called.
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What's the Difference Between 1.6L and 1.5T? Which One Has More Horsepower?

Even with the same engine model, the performance can vary significantly between manufacturers due to differences in technical capabilities. For easier comparison, let's use the Ford Focus as an example. The key differences are as follows: Displacement Difference: Both 1.5T and 1.6L represent engine displacement. 1.5T refers to a 1.5L turbocharged engine, while 1.6L indicates a naturally aspirated engine with 1.6L displacement. Fuel Consumption Difference: The 1.5T engine is more fuel-efficient. The 1.5T engine produces 180 horsepower, compared to the 1.6L's 125 horsepower. This means that when outputting the same horsepower, the 1.5T saves at least 1.2L per 100 kilometers compared to the 1.6L. Engine Type Difference: The 1.5T is equipped with a turbocharged engine. The fundamental difference between turbocharged and naturally aspirated engines is that the turbocharged engine increases air intake through the addition of a turbocharger.
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The Difference Between Having and Not Having Vehicle Damage Insurance

The difference between purchasing and not purchasing vehicle damage insurance lies in the coverage provided. If you buy vehicle damage insurance, the insurance company will compensate for the vehicle's losses caused by traffic accidents within the agreed scope. Without this insurance, the vehicle owner must bear all repair costs resulting from accidents. Besides covering vehicle damage, the vehicle damage insurance also includes protection against theft, engine water damage, spontaneous combustion, glass breakage, no deductible, inability to find a third party, and designated repair shop coverage. Vehicle damage insurance encompasses a wide range of coverages, including vehicle loss insurance, theft insurance, spontaneous combustion insurance, engine water damage insurance, glass insurance, inability to find a third-party insurance, and no deductible insurance. This means that previously optional no-deductible coverages are now only available as part of a bundled package, which is beneficial as it reduces many unnecessary disputes. When purchasing auto insurance, you can decide whether to include vehicle damage insurance based on your needs. However, it's important to understand that vehicle damage insurance protects your own vehicle. Therefore, if you don't purchase this insurance, you will be responsible for all repair costs after any damage occurs to your vehicle.
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