Bosch Group is the world's largest supplier of automotive technology, having entered the Chinese market as early as 1909 and has been in the 21st century since its entry into the 21st century. Bosch machine filters can be roughly divided into two major systems: Chinese sales and foreign sales, and the general price of machine filters sold in China is less than 30 yuan, which is not much different from the original machine filters, and most of them are OEM production. In foreign markets, Bosch's filter product line is more specialized, divided into Workshop for daily household use, Distance Plus for long-lasting use, and Premium FILTECH for the high-end market.
 
On websites such as Pretty motors, your auto space, gear4wheels, etc., Bosch's top product is Premium FILTECH, which is usually one of the top three on the list. As a major auto parts manufacturer, Bosch's machine filters have a very high test rate, and if you only focus on the product itself, Bosch Premium FILTECH does have a good point.
 
Purple Crown's filter paper can filter 99% of pollutants above 25 microns, while Bosch Premium uses FILTECH technology filter paper, which can filter 99% of pollutants above 20 microns, but only has a pollutant storage capacity of 14g, and the long-term effect is not as good as that of Purple Crown.
 
In terms of workmanship, the steel used in the American Premium FILTECH is textured, and it is also equipped with a silicone check valve, which is priced at 7-15 US dollars on Amazon in the United States, which is cost-effective, but Bosch has not introduced this product into China, and the purchasing price can reach 220-350 yuan, and there are many fakes, so it is recommended to buy directly from overseas shopping.