Compared with ordinary repair shops, 4S shops are much more reliable because they represent an automobile factory. Whether it's maintenance or oil change, it's a little more expensive than the outside repair shop. If the probability of using fake oil is low, on the one hand, it will smash its own signboard, on the other hand, it will be guaranteed if something goes wrong. This is not a barrel of oil, so if you don't have a reliable channel in the repair shop outside, I suggest you go to 4S for maintenance and oil change.