1, technology The dynamic balance equipment in 4S shop is more advanced. 4S shops generally use imported dynamic balancing machines, which can adjust tires more accurately, while some small auto repair shops use domestic dynamic balancing machines, which have low accuracy and are difficult to adjust accurately.

2. experience. Technicians in 4S stores are more experienced. Technicians in 4S shops are all professionally trained, with high technical level and rich experience, while technicians in some small auto repair shops are not professionally trained and lack relevant experience.