Why don't repair shops recommend car owners to bring their own accessories?

There is a certain reason why general repair shops do not recommend car owners to bring their own accessories.

The quality of self-contained accessories is not guaranteed, which affects word of mouth.

I don't believe that car owners who can't go to a 4S shop usually find a repair shop with a good reputation near their home, and the reputation of the repair shop comes entirely from these car owners. But the repair shop can't control the quality of accessories purchased online, and everyone is good at using accessories. If there is something wrong with the quality of the accessories, the owner will not think that there is something wrong with the accessories he bought at the first time, but will think that it is a matter of the repair shop, which will have a certain impact on the reputation of the repair shop. In reality.

The same labor, must get the same profit.

Take oil change as an example; If the purchase price of a barrel of engine oil provided by the repair shop is 100 yuan, and the owner needs to change a barrel to 150 yuan, most car owners will think that it is reasonable for the repair shop to earn 50 yuan. However, if the owner brings his own engine oil and the repair shop charges 50 yuan for working hours, then some car owners will start to complain that it is too expensive to collect 50 yuan in such a short time.

Actually; For a repair shop, whether it is the oil provided by itself or the oil brought by the owner, the labor they pay for changing the oil is the same. If the charging standard is lowered, the repair shop will have no profit, which means there is no point in doing this work. If you don't lower the charging standard, you will only be complained by car owners, so this is one of the reasons why many repair shops are unwilling to do this business.