What is a good way to purchase auto parts processing products?

Auto parts (auto parts) are the various units that make up the car as a whole and a product that serves the car.
With the increasingly fierce competition in the auto parts processing market, the penetration of environmental protection concepts, and the continuous upgrading and application of technology, the international auto parts processing parts industry has shown the following development characteristics in recent years:
①Automotive The trend of supporting parts processing system and modular supply is in the ascendant
②Global procurement of auto parts processing
③The transfer of auto parts processing industry is accelerating[1] 
There are many types of auto parts, nowadays There are more and more brands of cars, and more and more types of cars. Automobiles can be divided into passenger cars and commercial vehicles. Passenger cars refer to vehicles with less than nine seats (including driver's seat) and whose main purpose is to carry passengers. Specifically, passenger cars are divided into basic passenger cars, namely sedans, MPV models, SUV models, and other models such as pickup trucks.
Commercial vehicles refer to vehicles with more than nine seats (including the driver's seat) or whose main purpose is to carry goods. Specifically, it is divided into: passenger cars, trucks, semi-trailers, incomplete passenger cars, and incomplete freight cars.
With the improvement of people's living standards, people consume more and more cars, and the market for auto parts becomes larger and larger. In recent years, auto parts manufacturing plants have also developed rapidly.

What is a good way to buy auto parts products? How can I buy the most suitable and cost-effective auto parts? Here, I recommend the following tips to help you choose the best auto parts: The lost should be returned.
1. Looking at the packaging of the original accessories, the packaging is generally more standardized, uniform standard specifications, and the printing is clear and regular, and the packaging of counterfeit products is relatively poorly printed, and it is often easy to find the flaws in the packaging;
2 , Look at the color Some original parts specify a certain color on the surface, if it meets other colors, they are fake and inferior parts;
3, look at the appearance of the original parts, the printing or casting and markings are clear and regular, but the appearance of the counterfeit product Rough;
4. Look at the unscrupulous paint dealers who simply process the waste parts, such as dismantling, assembling, assembling, putting together, painting, etc., and then selling them as qualified products, illegally gaining high profits;
5 , Look at the quality of the original parts of the materials are qualified materials according to the design requirements, counterfeit products are mostly cheap and inferior materials substitute; 6. Look at the appearance of inferior products, although sometimes good, but due to poor production process, easy to crack , Sand holes, slag inclusions, burrs or bruises;
7, look at “storage” if there are problems such as dry cracks, oxidation, discoloration mirrors or aging of auto parts, it may be due to poor storage environment , Long storage time, poor material itself and other reasons;
8, see “join” if clutch plate rivet loosening, brake hose degumming, electrical parts joints desoldering, paper quality If the seam of the filter element is disconnected, it cannot be used;
9. Look at the identification part. The regular parts are marked with certain marks, such as the hour gear mark, the piston top mark and other assembly marks, which are used to ensure the machine parts. Install it correctly. If you don’t have it, you can’t buy it;
10. The regular assembly parts must be complete and intact to ensure smooth installation and normal operation. Some small parts on the assembly are missing, generally "parallel imports", which cause difficulties in loading. Often due to the shortage of individual small parts, the entire assembly is scrapped;
11. Look at the protective layer In order to facilitate storage and prevent the parts from bumping, the parts have a protective layer before they leave the factory. For example, bushings, large and small bearings, pistons, valves, etc. are generally protected with paraffin to prevent surface damage. These important accessories, if there is no protective layer on the surface, are mostly “parallel imports”;
12 , Look at some important parts of the certificate, especially the assembly category, such as carburetor, distributor, generator, etc., when they leave the factory, they usually have manuals and certificates to guide users in installation, use and maintenance. If they are not, they are mostly counterfeit. Fake and inferior products;
13. When purchasing auto parts according to specifications, the main technical parameters must be ascertained, and the special technology must meet the requirements for use. The appearance of some counterfeit and inferior products is almost the same as the real one, but it is not suitable to be installed. It is either larger or smaller. It is always unsatisfactory to use and leaves hidden dangers of accidents.
14. The test report issued by a third party can not only prove the authenticity, but also show the quality of it.