Why Do 4S Stores Not Advocate Using Oil Exchange Machines for Oil Changes?
2 Answers
Because transmission oil cannot be changed in a circulating manner; it must be completely replaced all at once. Relevant explanations are as follows: 1. Oil exchange machines inject new oil while extracting the mixed old and new oil, resulting in a high oil change rate and more thorough replacement, but it consumes more oil, is relatively wasteful, and involves higher costs. 2. For a car that has been used for a long time and has high mileage, if the transmission oil hasn't been changed for an extended period, certain sediment impurities will form in the transmission during use. These impurities, flowing with the transmission oil, can stick to the torque converter, hydraulic valve body module oil passages, or deposit in the oil pan and transmission filter. The longer the time, the more they accumulate.
Personally, I think 4S shops prefer not to use oil exchange machines mainly because gravity oil changes are easier for them to operate and more cost-effective. The gravity method simply involves draining the old oil and refilling with new oil—it's a quick process that doesn't require complicated equipment, making it manageable even during peak hours. In contrast, oil exchange machines require additional investment in equipment and maintenance, are prone to malfunctions, and could potentially hold the shop liable if issues arise. Gravity changes also allow mechanics to inspect the chassis for leaks while draining the oil, serving as an added service that makes car owners feel cared for and more likely to return for future business. Additionally, the gravity method typically removes most of the old oil, eliminating the risk of residual contaminants that might remain with an oil exchange machine—something that even gives me peace of mind. Ultimately, 4S shops prioritize efficiency, making gravity oil changes their go-to choice, especially for older vehicles or routine maintenance where fancy oil exchange machines are unnecessary.
