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There are clearly three filter elements in a car. Why do 4S stores and repair shops always ask you to change to four filter elements?

  • 6 Views
  • 2025-06-02

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Those who think there are three filters in a car cannot be said to be incorrect; they can only say that their answers are somewhat lacking. Those who claim there are four filters in a car are ignoring some models that lack one filter. Nowadays, the vast majority of cars are equipped with four filters, which are simply called "four filters" in the automotive after-sales industry.
The so-called four filters in a car refer to: the oil filter, the air filter, the air conditioning filter and the fuel filter. Among them, the oil filter, air filter and fuel filter are three types of filter elements that must be equipped in every car. However, the air conditioning filter is not necessarily equipped in all vehicles, and some mid-to-low-end cars are not equipped with it by the original factory. For instance, models such as Kia K2, Alto, V3 Lingyue, Baojun, Jimny, and so on.
What we car owners need to pay attention to is:

Among the four filters, the gasoline filter is rather special. It exists in two forms: built-in and external. The external type means that the gasoline filter is installed outside the fuel tank and is usually connected in series to the external gasoline pipeline. The built-in type means that the gasoline filter is installed inside the fuel tank and is generally installed on the gasoline pump assembly.
It is believed that the vast majority of car owners are not clear about the distribution location of the gasoline filter. But before replacing the gasoline filter in the future, please make sure to distinguish whether the gasoline filter of your car is built-in or external. Because in practical application, the two are essentially different. The external one needs to be replaced regularly, while the built-in one needs to be replaced as long as there are no problems related to it Then it doesn't need to be replaced.
It is precisely because many car owners are not clear about this issue that the built-in fuel filter is replaced, which leads to a lot of unnecessary trouble. Or, even though the built-in one has not been replaced, they still assert that it has been replaced. Since you generally do not verify whether the fuel filter has been replaced or not, you can only pay the wrong bill at the checkout!

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Dong Sen Filters

Qinghe County Dongsen Auto Parts Co., Ltd. is located in Qinghe County, Xingtai City, Hebei Province. It was established in 2024. Although the company was established a short time ago, it has more than 10 years of production experience. We are a manufacturer specializing in the production of air filters, air conditioning filters and oil filters. The filters produced by our factory serve the domestic and foreign markets and have won unanimous praise from customers in Southeast Asia, Africa, South America and other regions.