Why Do 4S Stores Not Advocate for Using Oil Circulation Machines for Oil Changes?

[StArya]

There are several reasons why 4S stores do not advocate for using oil circulation machines for oil changes. On one hand, gravity oil changes are faster and moderately priced, making them more acceptable to car owners. On the other hand, oil circulation machines carry a certain risk of causing transmission failures, which is why 4S stores generally prefer gravity oil changes. Below is a detailed introduction: 1. Oil consumption: Although oil circulation machines provide a more thorough oil change, they are not without drawbacks. Oil circulation machines can increase the oil change rate of transmission oil to over 80% through pressure, but because they require dynamic circulation, they demand more oil than gravity oil changes. Typically, transmission oil volume is 6-8 liters, whereas oil circulation machines require about 10-15 liters in total, and the additional cost may not be acceptable to car owners. 2. Disadvantages of oil circulation machines: For some older vehicles or those with higher mileage, there is a small probability of transmission failure after using an oil circulation machine. Although the probability is low, car owners should still be cautious. Over time, certain impurities may adhere to or deposit inside the transmission. When new oil is added, it is important to note that the new oil has stronger cleaning capabilities. Under the high pressure of the oil circulation machine, more impurities may be washed away, and flowing impurities could potentially clog components such as the torque converter, valve body, and filter, possibly leading to malfunctions during subsequent use.

[StTheo]

I've been driving for almost twenty years and regularly go to 4S shops for maintenance. When I asked them why they don't recommend the oil exchange machine, they said the machine sounds convenient but actually carries significant risks. For example, the machine relies on flushing to remove old oil, and it can't guarantee that all the oil and impurities will be completely cleaned out, especially small debris left in the transmission. Over time, this can damage parts or even cause malfunctions. The traditional gravity oil change, on the other hand, allows the old oil to drain naturally. The process is slower but ensures a more thorough cleaning. 4S shops prefer this method because it gives them the opportunity to inspect other components like filters or seals, resulting in a more comprehensive maintenance service with higher fees but greater peace of mind. I think their emphasis on safety first is worth the extra cost, as small savings could turn into major repair bills later. Next time I go for maintenance, I'll definitely insist on the gravity oil change method to avoid future troubles.

[LaJameson]

As a young driver, I've researched maintenance methods on forums. The oil exchange machine saves time and money, but the main reasons 4S shops don't recommend it are profit and standard procedures. The machine operation is complex, requiring special equipment, and if not done properly, it can damage the car's system with high risks; gravity oil change is simpler and they're more familiar with it. Moreover, the gravity method allows 4S shops to bundle more services like oil line inspections for additional charges. In terms of actual efficiency, gravity oil change is more reliable in removing old oil residues, preventing minor issues from becoming major ones. A friend tried the oil exchange machine at a small repair shop to save money, but big shops don't promote it to maintain quality and reputation. Considering everything, I choose the traditional method at 4S shops—it's more expensive but safer.

[StReagan]

In the auto repair industry, while the flush machine method for oil changes is quick, its effectiveness is unreliable. The flushing process leaves behind more old oil impurities, especially problematic for transmission fluid. Gravity draining relies on gravity to thoroughly remove old oil. Dealerships don't advocate flush machines due to safety concerns: improper operation can damage components, leading to higher repair costs. The gravity method is reliable and easier to control, paired with comprehensive inspections for better vehicle maintenance. When choosing a method, prioritize gravity draining for long-term safety - neglecting proper cleaning might save effort short-term but causes major vehicle damage and expenses long-term.

[DawsonLynn]

I always pay attention to cost-effective maintenance. The oil exchange machine sounds efficient, but 4S shops rarely use it. The reasons are unstable effects, residual old oil during machine circulation that may affect new oil performance. Compared to gravity oil change, it's slower but cleans more thoroughly. 4S shops prefer gravity method for higher profits, pairing it with inspections for more valuable services. Experience tells me incomplete oil changes lead to major transmission issues with high repair costs. I recommend following professional advice to choose gravity method - prioritize safety and reliability over cheap shortcuts.

[LaEmersyn]

In car maintenance, using a circulation machine for oil change theoretically saves time, but 4S shops often don't recommend it for various reasons. On the risk side, incorrect operation or incomplete removal of old oil can easily damage transmission components, leading to higher costs. In terms of effectiveness, gravity oil change ensures higher cleanliness as the oil drains completely. From a commercial perspective, 4S shops prefer the gravity method as it supports additional services like inspections, generating more revenue. Users need to balance convenience and safety. While the circulation machine saves time, reputable shops favor the traditional gravity method to ensure vehicle durability. Don't just focus on short-term convenience; choose a method based on proven results.