The paint mixing method in 4S shops and ordinary repair shops is the same. Don't listen to the so-called computer paint mixing. They are all idiots (I am engaged in car color matching, and I have done it in ordinary repair shops in 4S shops). Whether there is color difference and paint grade after repair has a great relationship with painters. 4S shop specializes in a certain car, which is more experienced (not absolute) than ordinary repair shops outside. There are also experts in the ordinary repair shop outside. If you want to save money and ensure the quality of paint, you'd better find an acquaintance who knows paint and find a place to buy paint and take it to the repair shop for spraying. 4S stores of the same quality are more expensive. There is nothing wrong with having an acquaintance in the maintenance industry introduce you to a master.