Why Do 4S Shops Use Gravity Oil Change?
2 Answers
4S shops adopt gravity oil change for the following three reasons: 1. Method: The gravity oil change method is simple and quick to operate. 2. Replacement volume: It can replace about one-half to two-thirds of the oil in the transmission. 3. Price: The oil change cost is relatively cheaper. The disadvantages of the gravity oil change method are as follows: 1. Replacement volume: The transmission oil is not replaced thoroughly, especially in some transmissions where a significant amount of oil remains inside. 2. Filter: Some transmissions cannot have their filters replaced, which can lead to early deterioration of the replaced transmission oil, failing to meet the specified service life.
I remember asking the technician about this during my last service. He said gravity oil changes are mainly simple and safe to perform—just unscrew the drain plug and it's done. Unlike machine-flush oil changes that require connecting equipment and pressurization, which could potentially damage transmission seals if not done properly. 4S shops prioritize stability and peace of mind. Although the oil replacement rate with the gravity method is about 70%, it's virtually risk-free. Plus, this traditional method is second nature to the mechanics—even an apprentice in the workshop can handle it, saving both time and equipment costs. The key point is that car owners are also accustomed to this method. Seeing the old oil gushing out actually gives them a more intuitive sense of reassurance.
