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Why don't new cars need a break-in period nowadays?

1 Answers
MacMax
07/30/25 2:19am
Because the engine has already undergone "cold break-in" during factory production, where metal components have been sufficiently friction-matched, eliminating the need for owners to perform break-in tasks. Related information: 1. Introduction: The so-called "break-in period" refers to the process of allowing automotive components to achieve optimal working conditions with each other. Before assembly, each metal component of a car is processed separately before being assembled together. 2. Precautions: Any mechanical processing inevitably has tolerances, and no metal component can be perfectly smooth like a mirror. Under microscopic examination, there will always be some degree of machining marks with imperfections. This results in assembled metal components that rub against each other exhibiting a "sandpaper against sandpaper" state, hence requiring a break-in period.
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Where is the cabin air filter located in the Volvo S80?

The cabin air filter in the Volvo S80 is located beneath the glove compartment on the passenger side. Here are the steps to remove the Volvo S80 cabin air filter: 1. Pull out the passenger-side storage compartment; 2. Pull the fixed handle on the left side of the storage compartment outward; 3. Remove the buckle from the handle; 4. Push the storage compartment simultaneously from both sides to detach it; 5. The cabin air filter will then be visible—press the fixed buckle firmly to remove the filter. The Volvo S80 is a model produced by Volvo, classified as a mid-to-high-end Nordic luxury sedan. It comes fully equipped, with particularly comprehensive safety features, including front and side airbags, as well as inflatable curtains on both sides of the cabin.
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How to Eliminate Gear Shift Jerkiness in Automatic Transmissions?

Gear shift jerkiness in automatic transmissions cannot be completely eliminated. Theoretically, except for CVT transmissions, all other automatic transmissions may exhibit some degree of jerkiness due to their inherent design characteristics. Even continuously variable transmissions may experience jerkiness depending on the manufacturer's tuning. Generally, transmissions with more gears exhibit less jerkiness because the gear ratio intervals become smaller. If the jerkiness is particularly severe, it may indicate issues with the transmission fluid, necessitating a fluid change. There are two methods for changing transmission fluid: gravity drainage and machine-assisted circulation. Gravity drainage is more economical but less thorough, while machine-assisted circulation, though more expensive, ensures a more complete fluid replacement. If severe jerkiness persists after fluid replacement, the transmission assembly may be faulty, requiring replacement at an authorized dealership or professional auto repair shop.
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What are the automatic transmission pickup trucks available?

Automatic transmission pickup trucks include the Isuzu DMAX, SAIC Maxus T60, Huanghai N3, Nissan Navara, Nissan Rich, and others. With the continuous development of automotive production technology, automatic transmission pickup models have gradually entered the automotive market. Consumer awareness of pickup models has also increased, leading to more new models in the pickup market and higher usage demands from consumers. The Isuzu DMAX is the first automatic transmission pickup truck in China, meeting the needs of consumers. The SAIC Maxus T60 is the first pickup model launched by SAIC Maxus, offering multiple variants to cater to different consumer needs. The Huanghai N3 is a newly launched pickup with a unique design style, featuring a robust American pickup appearance. The Nissan Navara is a joint venture vehicle, positioned as a high-end SUV-level pickup, distinguishing it from other models. The Nissan Rich belongs to the Dongfeng brand under Zhengzhou Nissan, with bold and angular body lines and a new wide-mesh grille design that exudes a strong sense of power.
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How to Use the D and S Gears in an Automatic Transmission?

How to use the D and S gears in an automatic transmission: 1. When using the D gear in an automatic transmission car, the onboard computer will automatically control the car's gears according to the pre-set program. During driving, the car will shift up and down completely based on the pre-set program; 2. While driving, switching to the S gear does not require pressing the brake pedal or decelerating. The D gear in an automatic transmission is the forward gear, and this gear is also the most frequently used one. The S gear is the sports mode in the car. When using the D gear, the engine speed does not rise particularly high during gear shifts in the automatic transmission. When the engine reaches an appropriate speed, the automatic transmission will shift gears automatically. Switching to the S gear sports mode while driving will cause the engine speed to rise instantly. This mode is generally not used frequently and is only employed during overtaking or when driving on uphill sections.
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Should You Press the Brake When Shifting Gears in an Automatic Transmission?

Automatic transmission requires pressing the brake when shifting gears, typically only mandatory when shifting from P (Park) to other gears. Switching between other gears does not strictly require pressing the brake. However, from a safety perspective, it is recommended that drivers press the brake when performing gear shifts in automatic transmission vehicles. Regardless of whether gears can be freely switched, shifting gears while the vehicle is in motion is unsafe and can cause some damage to the car's transmission. If you shift into drive without pressing the brake, the car may lurch forward suddenly. If a novice driver panics and accidentally presses the accelerator, the vehicle could accelerate unexpectedly, increasing the risk of an accident. The same principle applies when reversing.
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What Causes the Clicking Sound When Shifting Gears in an Automatic Transmission?

The clicking sound when shifting gears in an automatic transmission is caused by shifting while the vehicle is not completely stopped: When parking, the vehicle should be brought to a complete stop before shifting the gear lever from D (Drive) to P (Park). If the vehicle is not fully stopped when shifting to P, the P-lock hook inside the transmission will strike the gear, producing a clicking sound. This operation can cause wear or even breakage of the lock hook, and in severe cases, it may lead to transmission failure. Another possible reason for the clicking sound when shifting gears in an automatic transmission is when shifting from P to other gears. This is because the P gear has a locking mechanism that locks the transmission gear once engaged, preventing the vehicle from moving even without the parking brake. When shifting from P to other gears, the locking mechanism disengages, and it is normal to hear some noise during this process.
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